Naval guns and gunnery

Naval guns came into general use in the West until about the 14th century. They replaced the tactics or ramming or boarding and became the main naval weapon when it was realized they could sink an enemy ship some yards away, regardless of the wind.

First guns: 15th century

The first guns were tubes built up from bars of iron secured with iron bands. These guns were breechloaders with a separate gunpowder chamber, or servidor, which was wedged into the breech after the stone, or ball, had been inserted. Muzzle-loading cast-bronze guns came into use soon after the wrought-iron breechloaders. When the Turks besieged Constantinople in 1453, they cast, on the field of battle, bronze guns that weighed 19 tons and hurled 600-pound (270-kg) granite stones. Cast-iron guns came into being soon after cast-bronze guns. Despite distinct advantages of cast iron, problems of controlling the quality of iron retarded its acceptance, and for centuries both cast-iron and cast-bronze guns were used.

Although the date when guns were adopted aboard Western naval vessels is uncertain, an illustration of a galley used by the English in 1347 against the French at Calais shows two guns of unspecified type fixed in the bow of the vessel so as to fire ahead. Two centuries later, cast-iron, cast-bronze, and banded wrought-iron guns were all used aboard ship, as is evidenced by the salvage of the "Mary Rose", the flagship of English King [[Henry VIII) (sunk in 1545 and salvaged in 1836) which contained guns of all three types. Arrows and stones, used in early guns, gave way to cast-iron balls, and some of these were found in the guns from the "Mary Rose.

The earliest gunpowder was a finely ground mixture of charcoal, saltpeter, and sulfur. This mixture, known as "serpentine powder," tended to absorb moisture, to separate into its components while being transported, and did not burn if packed too tightly into a gun. It gave way in the 15th century to corned powder which was pressed into pellets and screened to a uniform size.

Changes in mountings kept pace with other aspects of gunnery. In early mountings on galleys, the gun was placed in a wooden trough and secured to the deck. A heavy post, or bitt, at the breech prevented recoil. With heavier projectiles and larger charges of powder, this recoilless system failed, and was modified to permit the trough to slide upon the deck. Eventually two or four small wooden wheels were attached to the trough, making a carriage. To check the recoil, a heavy rope or "breeching" was run from the breech of the gun to the side of the ship. Field carriages with high wheels were undoubtedly also used aboard ship. They would have been both awkward to handle and dangerous until the high wheels were replaced by low ones.

At the time that guns were being introduced into naval use, the nature of naval vessels was also changing. Small oar-driven galleys were giving way to larger ships in which sails were necessary. In the Mediterranean, the galleass, which used both oars and sails, was developed. Its form favored the use of guns arranged at intervals along the sides of the vessel and over the rowers' heads. In the North Atlantic, the galleys were abandoned in favor of small sailing vessels which gradually gave way to larger vessels, such as the half-moon shaped galleons. The sailing ship was particularly advantageous for the mounting of guns, since there was no problem of interference between guns and rowers. The larger sizes of sailing vessels were constructed with sides curving inward ("tumbled home") above the waterline, thereby strengthening the ship and making it a more steady gun platform. The entire development was greatly stimulated by the invention of the gunport, attributed to Descharges of Brest, in 1501.

Gunports made it possible to range the guns on various decks along the sides of the vessel and marked an important step toward the development of the broadside ship. One of the earliest of large armed ships, the "Makalos", which burned in 1564, contained 178 guns, including 67 cannons and smaller weapons which were mounted on swivels. The Spanish ship "Philip" which engaged the English in 1591 carried three tiers of ordnance on a side with eleven pieces to the tier. This ship also had eight guns forward and a number astern. The heaviest gun then in use in the Ebglish Navy was the culverin weighing 4,500 pounds (2,000 kg) and firing a 171-pound17 -pound (7.8-kg) ball with an extreme range of 2,500 paces. Next in size was the demicannon weighing 4,000 pounds (1,800 kg), which fired a 301-pound30 -pound (13.7-kg) ball to 1,700 paces; smaller guns included the cannon-petroe or periers, sakers, minions, and falconets. The effective ranges of these guns were only a small fraction of the extreme ranges. (See also Artillery.)

The use of guns in naval battles was described as follows in a Spanish lecture of about 1530: Bow guns or broadside guns on the side from which boarding was planned were fired only when the ships were relatively close to each other, the lower guns firing at the waterline and the upper guns and smaller cannon at the sides, sails, masts, and men on the poop deck. The crossbowmen and harquebusiers did not fire until the enemy was very close or in the act of boarding.

The importance of naval guns was demonstrated in a sea fight off Preveza, Greece, in 1538 and was confirmed in the victory of the Christians over the Turks in the Battle of Lepanto in 1571. In the latter engagement, heavy guns, particularly those mounted on the galleasses, served to break up the charges of Turkish vessels. Smaller firearms, such as harquebues, were probably more important than bows and other smaller weapons in close-range fighting. Some 17 years later, the British repelled the Spanish Armada using their guns from a range which prevented the Spanish from closing for hand-to-hand fighting. Thus, in the 16th century, the gun proved to be an important and sometimes decisive factor in naval warfare. This was formally recognized in 1618 when the British Commission on Naval Reform reported that sea fights were "chiefly performed by the great artillery breaking down masts, yards, tearing, raking, and bilging the ships. ..."

The Broadside Ship

Recognition of the importance of the gun resulted in ships with improved gunnery characteristics. The "Royal Sovereign", launched in England in 1637, was probably the first three-decked British warship and she proved extremely serviceable. Her builder, Phineas Pett, described her armament in his journal:

Her lower tyre [tier] hath thirty ports which are to be furnished with demicannon and whole cannon ... ; her middle tyre hath also thirty ports for demiculverin and whole culverin; her third tyre hath twentie six ports for other ordnance; her forecastle hath twelve ports, and her half deck hath fourteen ports; she hath thirteen or fourteene ports more within board for murdering pieces, besides a great many loope-holes out of the cabins for musket shot. Shee carrieth moreover, ten pieces of chase ordnance in her right forward, and ten right aff [aft], according to lande service in the front and reare.

Although one of the finest ships of the day, the "Royal Sovereign" was cut down to two decks before distinguishing itself in the wars during the Commonwealth and the reign of Charles II. A British history of naval architecture published in 1851 shows drawings of this vessel superimposed on drawings of a ship of the mid-19th century; aside from its greater beam, the 19th-century vessel was amazingly similar to the 17th-century Royal Sovereign. Thus this ship may be considered the archetype of naval vessels for the next two centuries and to have marked the rise of the full-fledged broadside ship.

In contrast to the many changes which had occurred with the adaptation of guns to sea warfare, naval gunnery remained surprisingly static for the next two centuries. It has often been pointed out that a sailor in the British fleet that turned back the Spanish Armada would have been at home on most naval vessels up to the American Civil War. The ship of the line, or broadside ship, with heavy guns mounted on the lower deck just above the waterline and with lighter guns on higher decks, remained the dominant factor in naval warfare. There were, to be sure, constant gradual changes, both in the guns and in the ships, but these changes were relatively minor, even in cumulative effect. Despite this, certain basic advances occurred--some of a theoretical and some of an empirical nature--which were to contribute to the naval revolution of the 19th century.

Gunnery technique

Gunnery long remained a mysterious art in which every element was variable. Shot was widely different in size because of lack of care in manufacture and because of rusting while in storage, powder varied greatly in strength and burning rate, the bore of the guns was not closely controlled, and the laws governing the passage of projectiles through the air were hotly disputed. A British scientist, Benjamin Robins, in two papers published in 1743 and 1747, put forward basic theories and supporting experimental data which, although largely overlooked for the better part of a century, formed the basis of the science of ballistics. Robins proposed that the bore of the cannon be enlarged, that they be equipped with snug-fitting balls, and that they be fired with decreased charges of powder. This, he believed, would (even at the cost of reduced range) increase destructive power, since the larger ball with a relatively low velocity would do more damage than would a smaller one. He further urged that careful attention be given to designing new guns to eliminate unnecessary weight. In 1779, the carronade, manufactured by the Scottish firm of Carron and Company, made its appearance, and it incorporated many of the features advocated by Robins. These short-barreled, light-weight, large-bore guns used a small powder charge and the same projectile as did the long guns. The British adopted carronades as a means of installing additional guns on existing ships and armed many of the smaller ships, such as frigates, sloops, and brigs, entirely with carronades. Similar guns were put into service by the Dutch, French, Spanish, and United States navies. The carronade's short range eventually led to loss of interest in it as a naval weapon. In two actions during the War of 1812, this shortcoming was an important factor in determining the victor. In the Battle of Lake Erie, American forces fought with long guns from beyond the range of British ships, and the English commodore reported, "We remained in this mortifying situation five hours, having only six guns in all the squadron that would reach the enemy, not a carronade being fired." In another action, the British ships Phoebe and Cherub, armed with long guns, captured the American frigate Essex, which was equipped almost entirely with carronades. Despite its shortcomings, the carronade demonstrated the importance of quick-firing weapons and the need to use projectiles which fitted snugly into the bore of the gun.

The chief emphasis in naval gunnery was on the broadside ship and the long guns that served as decisive elements in combat between ships at sea. For other naval purposes, however, other gunnery devices were used. The fire ship which was loosed into enemy ship concentrations was a weapon of antiquity. With the development of gunpowder, powder ships were used in preference to fire ships. For example, in a 1693 attack on the French port of Saint-Malo, the British Commodore Benbow loaded a galliot with 100 barrels of powder and 340 chests containing cannon balls, iron chains, large pieces of metal, and other destructive missiles. This ship was cast adrift and grounded on a rock in the harbor where it exploded, blowing down part of the town wall and severely damaging the houses.

In addition to powder boats, bomb ketches were used for attacking facilities ashore. These were equipped with mortars, cannon with a large bore and a short barrel which threw their projectiles at a high angle and were particularly well suited for attacking targets protected by heavy walls. The French in the siege of Algiers in 1681 used seven bomb ketches, or galliotes-à-bombes, each mounting two mortars, some of which were 14-inch caliber and threw 140-pound projectiles. These projectiles were perforated or laced envelopes containing conbustibles and were ignited by the explosion of the propellant charge.

Hollow shells loaded with powder proved more effective than fire for many purposes. The powder was exploded by means of a slow match (burning fuse) which was either ignited by the explosion of the propellant or by hand just before the mortar was fired. Bomb ketches came to be widely used for bombarding seaports and shore fortifications. Explosive shells and incendiary carcasses were also fired from long guns ashore. However, the risk of fire or premature explosion was so serious that there were only isolated examples of firing explosive shells from long guns afloat. In 1788, for example, the Russian government fitted a flotilla of long boats with brass ordnance and attacked a Turkish squadron at the mouth of the Liman River on the Sea of Azov and, through the use of explosive shells, gained a complete victory. Throughout the period of the French Revolution, the French experimented with explosive and incendiary projectiles, but experienced many disasters to their own ships as a result.

Explosive shells

The general acceptance of explosive shells for use on large ships at sea can be traced to the proposals of a French artillery officer, Henri Joseph Paixhans, who in papers published in 1822 and 1825 proposed a new system of ship armament based on their use. Paixhans' theories depended on the development of the steam-powered ship into a vessel of war. He advocated that all guns aboard a ship be of the same bore --and that explosive shells be used, thereby simplifying the instruments of warfare and augmenting their destructiveness. In experiments strikingly similar to work performed a decade earlier in the United States by Robert Stevens, Paixhans demonstrated that explosive shells could destroy wooden ships, and he proposed to protect the ships by encasing their sides with iron plates; this led to the development of armored naval vessels. Although Paixhans' system was not adopted in its entirety, the French in 1829 standardized on a single caliber (a 30-pounder) which was made in different weights for use on the various decks and classes of ships. Some eight years later, the French adopted a Paixhans-design shell gun, but of much larger bore than the 30-pounder. The British reacted almost immediately to this second decision and in 1839 adopted six patterns of 32-pound long guns, associating with them a few eight-inch shell guns. Other countries quickly added the Paixhans guns to their naval ordnance, and the correspondence of the United States Navy Department for the 1840s contains many references to ships furnished with Paixhans' guns.

In 1837, Captain T. F. Simmons of the British Royal Artillery proposed a system in many ways the reverse of that advocated by Paixhans. Instead of standardizing on a maximum number of short-range guns, Simmons advocated arming ships of war with a few long guns of maximum caliber and muzzle velocity and using other guns of the same caliber but of lesser weight and range for the upper decks. In short, he argued that instead of crowding as many guns aboard ship as space would permit, the most powerful guns that the ship could safely carry and fire should be used and that their number should be limited by the over-all capacity of the vessel. Although this line of thinking did not immediately predominate in the design of naval vessels, its impact can be seen in the design of battleships in the later years of the 19th and on into the 20th century.

Projectiles

The projectiles which were used through the early 19th century varied depending upon the target. Solid cast-iron balls were used in attacking the hulls of other ships. Chain shot, consisting of two shot secured to each other with a length of chain, and bar shot, consisting of two solid hemispheres secured by a bar, were effective at short range against sails and rigging but were very inaccurate in their flight. Canister and grape shot were used against the crews. Canister was a tin cylinder fitting the bore of the gun and packed with musket balls. Grape shot was larger balls held in a cylindrical frame. Both types broke up on leaving the muzzle, with the clustered balls dispersing.

Shrapnel

Grape and canister fell into disuse after a British army officer, Henry Shrapnel, devised a thin-cased shell containing musket balls and a powder bursting charge. A burning fuse ignited the powder while the shell was in flight and liberated showers of small missiles. Hot shot also came into use against wooden hulls. It was fired with just sufficient velocity to splinter the wooden sides and render them favorable for burning when ignited by the heat of the ball. Experiments were also conducted with shells filled with molten iron or with phosphorus dissolved in carbon disulphide, which would ignite spontaneously on exposure to the atmosphere after bursting. These projectiles inevitably fell into disuse with technological advances.

The 19th Century Naval Gunnery Revolution

The 19th century saw striking advances in technology. The steam engine was adopted for marine propulsion after 1820; ships were built of iron after 1850; armored naval vessels came into being; and guns increased in size and power. These developments occurred almost simultaneously and affected each other. Steam was not only used to power the ship but also provided for mechanical handling of the guns, which freed them from limitations in size that had been imposed when only manpower was available. The use of iron as a structural material permitted larger ships than had been possible with wood, and larger guns could consequently be carried. The same metallurgical advances upon which iron hulls and armor plate were based permitted the design of stronger guns. The development of armored ships demanded comparable development in the power of naval guns. As the armor grew thicker and stronger the guns had to be more powerful, and the entire ship much larger and more stable.

Many steps were involved in this process and basic advances were sometimes abandoned because they were beyond the technology of the day. For example, the first naval vessel to be fitted with screw propellers, the U.S. Navy's "Princeton", was also fitted with two 12-inch, wrought-iron guns. These guns proved to be beyond the metallurgy of the period and during a public demonstration in 1844 one of them burst, killing five people including high officials. In 1854 a British engineer, William Armstrong, perfected techniques for making guns of wrought iron. Almost simultaneously, Alfred Krupp of Germany began making guns from cast steel ingots. Their fabrication techniques made possible the high-power guns which came to characterize naval ordnance. Krupp and Armstrong each designed breech-loading mechanisms and fitted their guns with both rifled and smooth-bore barrels. Considerable development was necessary before the breechloaders achieved definite superiority over muzzle-loaders. The greater range, velocity, and accuracy which were the advantages of rifled guns were offset by the higher stresses imposed on the barrel and by other design problems. Rifled small arms had been in use for hundreds of years, but their advantages of greater accuracy and longer effective range were largely offset by the disadvantage of slow rate of fire until elongated bullets permitting rapid loading were developed in the mid-19th century by the French. To provide strength to withstand the increased working pressure of large rifled guns, the French in 1859 adopted a system of reinforcing with hoops of puddled steel. Other European nations followed suit.

During the American Civil War, Lt. John M. Brooke of the Confederate Navy fabricated rifled cast-iron guns hooped with wrought-iron rings. The greater portion of American effort, however, went into improving cast-iron smooth-bore guns. John A. Dahlgren of the U.S. Navy followed ideas first suggested by Benjamin Robins nearly a century earlier and, building on the work of Paixhans and others on proportioning guns, greatly improved the shape of long guns. He determined the exact amount of strain and its location within the gun and attempted to proportion the parts of the gun with reference to this strain. He thereby completely abandoned both the ornamentation and the traditional shape for heavy guns. T. J. Rodman of the U.S. Army devised a system of casting guns hollow and cooling the inner surfaces while the metal hardened. This redistributed the strain within the gun and overcame the elastic peculiarities of cast iron, making it possible to cast guns with a bore of up to twenty inches and a gross weight of nearly 60 tons, but with a life comparable to that of smaller guns. The same technique, however, increased the life of smaller guns by a factor of ten to twenty times.

The old wooden naval gun carriages mounted on wheels and using a heavy rope breeching to absorb recoil were replaced by iron carriages fitted on an inclined slide. Various devices, such as the friction of interlaced iron plates, were used for absorbing recoil. The gun carriages were fitted with wheels running on concentric tracks, thereby simplifying the training of the guns. As the guns became larger, turntables originally designed in America by John Ericsson and in England by Captain Gowper Coles for the purpose of training heavily armored turrets were adapted to the primary use of training guns. Steam powered turntables, however, offered far from perfect control of the turning motion, and in the mid-1870s, William Armstrong perfected the application of hydraulic power to gun turrets. As developed by the Armstrong Company of Great Britain and applied in the "Dreadnought" (1875), hydraulic power was applied to all the principal operations of working the gun, such as checking the recoil and moving the gun in or out along the slides and ramming home the powder and charge. Thus, the basic problems of designing carriages for heavy naval guns were solved. The U.S. Navy adopted electric drives, which were eventually superseded by variable-speed gears. Power drives were also utilized on the smaller secondary batteries which served tactically for close-range attacks.

The naval race in technology pitted the Italian "Duilio" and the British "Inflexible", both completed in 1876. The Italians first planned to use four 35-ton guns on the "Duilio", but in response to the manufacturer's offer to make guns of much greater weight and power determined to adopt 60-ton guns. The British, who had planned to install 60-ton guns on the "Inflexible", then decided to mount 16.5-inch guns weighing 80 tons. The Italians in turn adopted 17.7-inch guns weighing 100 tons for the "Duilio". This competition indicated that the striving for superiority in individual ships was one of the guiding principles of naval construction.

The increase in size of guns was in part caused by an increase in the length of the barrel. Longer barrels gave the projectiles a greater velocity, but posed other problems. As gun barrels became longer, muzzle loading became impossible; the British adopted breech-loading guns in 1880 as other European navies had done earlier.

Innovations in Powder

To obtain maximum effectiveness from the longer barrel, the burning rate of the powder needed to be closely controlled. Much experimentation was performed on the effect of size and shape of powder particles on rate of burning, and larger grains were provided for larger guns. Changes in composition were also experimented with, and in the 1880s brown powder made from under-burnt charcoal was adopted as one means of decreasing the burning rate. A serious drawback of these gunpowders was that only about half of the mixture was converted into gas, the remainder becoming a dense smoke. The French in 1886 adopted smokeless powder made of nitrocellulose (gun-cotton). Four years later, the Royal Navy began using smokeless powder made from a nitroglycerine base. Both these compounds liberated four to five times as much energy as did the black powder used earlier. In addition, these chemically homogeneous powders could be formed readily into grains so shaped as to control the rate of burning. This gave a uniform pressure, permitting a higher projectile velocity without straining the gun. Black powder continued in use as an igniter for the propellant charge, particularly in the larger guns. With later developments, propellants consisting of either nitrocellulose or nitroglycerine were described as "single-base" powder; others containing both were described as "double-base"; and a third category containing nitrocellulose, nitroglycerine, and other chemicals was called "triple-base" or "multiple-base." At the close of the 19th century, the U.S. Navy followed the lead of the French and adopted a nitrocellulose powder as a propellant charge.

This proved reasonably satisfactory until World War II night engagements, when smokeless powder was objectionable because its flash temporarily blinded the ships' crews. Various flash suppressors were devised and mixed with the powder, which was formed into grains for small guns and into pellets for the larger guns. The British used a multiple-based powder, Cordite N, which was relatively flash-free, but which the U.S. Navy considered to be brittle, unduly sensitive to shock, and hazardous in hot climates. As a result the United States developed other flashless powders and was placing one of them, Albanite, in large scale production at the end of World War II.

Despite the adoption of smokeless powder, black powder still continued in use as a burster charge for projectiles until just before World War I, when more powerful and less sensitive explosives were adopted. In the U.S. Navy, trinitrotoluene (TNT) was adopted for smaller projectiles and Explosive D (ammonium picrate) for the larger ones. These continued in use throughout World War II, although by the end of the war more powerful explosives had come into use, particularly in the smaller antiaircraft projectiles. If the entire spectra of powder uses is considered--torpedoes, mines, aerial bombs, and rockets, as well as large and small projectiles--the trend in explosive development, beginning with the adoption of smokeless powder, was to recognize the special demands of various uses and to formulate specialized compounds tailor-made to particular requirements.

If any one factor can be isolated as stimulating developments of the later years of the 19th century--improved materials (wrought-iron and then steel), increases in size, improvements in projectiles, mechanization, and improved powder--it was the necessity of penetrating armor, which was also rapidly developed and which gave ships an ever higher degree of protection. Much of the improvement to guns appears to have been accomplished without much attention to the fact that the ranges of guns were also being greatly increased. The emphasis upon short range might best be illustrated by recalling that, between the Civil War of 1861-65 and the Spanish-American War of 1898, ramming was looked on as a naval tactic of an importance comparable to that of gunnery. The necessity of fighting at maximum range, which was gradually recognized, called for a high degree of accuracy so that shells could be placed on a target many miles distant. In 1892, a U.S. naval officer, Bradley A. Fiske, invented the telescopic sight, with which guns could be aimed more accurately, particularly at long range. About 1906, the introduction of periscopic gun sights greatly improved positions for gun pointers and trainers. Still later, range finders provided an accurate means of measuring the distance to a target. Exploitation of the capabilities thus given to naval guns is attributed largely to Percy Scott of the British Navy and William S. Sims of the U.S. Navy. These men championed the importance of accurate long-range shooting and devised training techniques whereby the potential which had been given to naval guns could be achieved.

20th century

Before the outbreak of World War I, the British and Germans introduced what has been called the "director" system of fire. Guns were placed in parallel alignment and by means of electrical control were aimed and fired in salvos from an elevated position. Optical range finders and electrical instruments to aid in fire control were mounted in these elevated positions. Under this system, not only was the fire of all guns controlled from a single elevated point, but the shot fell together in a small pattern which could be "spotted" on the target. This led to a great extension of range and made it possible to fire in heavy weather which obscured the vision of the gun crews. The elevation that could be given to guns on British ships was increased from 13½°13fd in 1909 to 40°40d in 1917. After the end of the war the U.S. Navy achieved further refinements in fire control, such as having each ship fire shells with a distinctive color in bursting so that the shots of each could be distinguished. Techniques were also developed for spotting by use of cruisers or aircraft, and night firing was perfected through the use of star shells which burst over the enemy. Through such techniques the effective range of the modern 16-inch (41-cm) naval rifle came to be approximately 20 miles (32 km). Among the data necessary to achieve accuracy over this great a distance was a correction for the rotation of the earth during the time of the projectile's flight.

While the improvement of naval gunnery continued, the development of the airplane into an instrument of war during World War I necessitated a means of defense aboard naval vessels. Guns of secondary batteries were given sufficient elevation for use in air attacks, and projectiles and fuses for use against aircraft were developed. With the onset of World War II, 20- and 40-millimeter automatic guns were used in increasing numbers. Since the end of World War II, the emphasis within antiaircraft defense batteries has shifted from these weapons to 3- to 5-inch (8-13-cm) guns fitted for automatic loading and aiming. The rate of fire of these guns has been greatly increased over that of earlier guns of similar sizes.

World War II saw the replacement of the battleship by the aircraft carrier as the capital ship of seapower. This brought with it the replacement of heavy guns by bombs delivereed by air and torpedoes (delivered bvy airplane or submarine, and also destroyers) as the chief offensive weapons of naval warfare. The submarine also occupied a role of primary importance during World War II.

After 1960 another revolution was initiated--that of the guided missile. The influence of the guided missile on warfare has been comparable in effect to the introduction of the gun in the 14th century, steam and mechanization in the 19th century, or the aircraft in the 20th century. Early missiles were launched from shore bases or from aircraft, and with the exception of the German V-2 rocket, were essentially unmanned aircraft; however, the overall capability of missiles has been greatly extended in the postwar years.

Missiles are normally classified by their launching vehicle and target as air-to-air, air-to-surface, surface-to-surface, underwater-to-surface, or surface-to-air. This classification clearly indicates their relationship to other naval weapons: the air-to-air missile is replacing the gun in naval aircraft; the air-to-surface missile, the aerial bomb; the surface-to-surface and underwater-to-surface missiles the long-range heavy gun; and the surface-to-air missile is replacing the antiaircraft battery. Many U.S. cruisers, destroyers, and aircraft carriers are fitted with surface-to-air missiles. Other naval powers also have guided-missile ships in operation or under construction. Most guided-missile ships are still equipped with guns, although the trend is toward increasing the number of missile batteries and decreasing the number of guns.

The role of naval gunfire in supporting amphibious operations remains of importance. Beyond the scope of this form of bombardment, seaborne weapons also have a share in the delivery of nuclear ballistic missiles against targets deep in continental landmasses; this mission involves the use of missiles fired underwater from submarines.

Anti-aircraft gunnery

Anti-aircraft gunnery was a tradeoff between 5" guns, with their long range, and 20 and 40 calibre short-range guns with a high rate of fire. The breakthrough came in 1943 with the introduction of the proximity fuze (or "VT fuze") in 5" shells. It had a radio and receiver and when a signal bounced back, it was in range and exploded. The effect was to make the target 50 times bigger and thus much easier to hit. The fuzes played a decisive role in defeating the Japanese Kamikaze attacks of 1944-45. The British had invented the device but lacked the massive industrial capacity needed to produce it in quantity, so shared the blueprints with the U.S. Navy. The basic components are a vacuum tube (six inches long and three inches in diameter) a battery, and a radio transmitter and receiver, all of which have to be rugged enough to withstand 20,000 Gs when shot out of a gun at high velocity. After the shell is fired and begins rotating, a chemical reaction produces an electrical charge which in turn arms the shell and sends out a radio impulse. The return signal, reflected from the target, detonates the shell prior to impact and produces the devastating effects.

See also

• Explosives
• Gunpowder

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