QF 6-pounder Hotchkiss

Argentina adopted the 40 caliber Hotchkiss 6-pounder in the 1890s, to arm its four Giuseppe Garibaldi-class armored cruisers, purchased from Italy. The Argentinians were at that time engaged in a naval arms race with Chile. The last ships from this class were retired from service on 2 August 1954.

Brazil adopted the 40 caliber Hotchkiss 6-pounder in the 1890s, to arm its coastal defense ships, protected cruisers and torpedo-gunboats. The Brazilians also used the competing Nordenfelt 6 pounders in lesser numbers. The last Brazilian ship retired was the coastal defense ship Marshal Floriano in 1936. The former Brazilian coastal defense ship Marshal Deodoro was sold to Mexico in 1924 and renamed Anáhuac, which was retired in 1938.

Chile adopted the 40 caliber Hotchkiss 6-pounder in the 1890s, to arm a battleship, an armored cruiser, and several protected cruisers. The last of these ships was retired in 1933.

China adopted the Hotchkiss 6-pounder in the 1880s, to arm its protected cruisers. During the First Sino-Japanese war, ships on both sides were armed with Hotchkiss 6-pounder guns. Surviving 6-pounder guns were in Chinese service aboard gunboats and auxiliaries during the Second Sino-Japanese War and World War II.

Despite originating in France the 6-pounder was not widely used by the French. Like the British, who paired their QF 3-pounder Hotchkiss guns with the larger 6-pounder, the French often paired their 3-pounders with the more powerful Canon de 65 mm Modèle 1891. This gun is sometimes referred to as a 9-pounder in English publications. During World War II a few Flower-class Corvettes (Aconit, Commandant Drogou, Commandant Détroyat, Commandant d`Estienne d`Orves, Mimosa, Renoncule, Roselys) of the Free French Navy were armed with two 6-pounder guns.[5]

A 6-pounder gun was fitted to the single Vickers Mk. D tank used by the Irish Army between 1929 and 1940. When the tank was scrapped in 1940 the gun was removed and used as an anti-tank weapon.

Italy adopted the 40 caliber Hotchkiss 6-pounder in 1886 to arm its armored cruisers, battleships, protected cruisers, torpedo boats and torpedo cruisers. The Italians also adopted the competing 43 caliber Nordenfelt 6 pounder gun and by 1909 the Nordenfelt had replaced the Hotchkiss in service.[6] This was the opposite of the British who replaced their Nordenfelt guns with Hotchkiss guns.

Japan adopted the 40 caliber Hotchkiss 6-pounder in the 1880s to arm its destroyers, protected cruisers and unprotected cruisers. The Japanese versions of the 6-pounder were known as Yamanouchi guns and were largely identical to their British equivalents.[6] Ships on both sides of the First Sino-Japanese war and Russo-Japanese war were armed with Hotchkiss 6-pounder guns. The 6-pounder was the standard secondary and tertiary armament on most Japanese destroyers built between 1890 and 1920, and was still in service as late as the Pacific War.[7]

The Russians began purchasing 40 caliber 6-pounders from France starting in 1904 to replace its 3-pounder and 1-pounder guns in the anti-torpedo boat role. In addition to 40 caliber guns, 50 and 58 caliber guns were also produced under license at the Obukhov State Plant.[6] These were installed on torpedo cruisers and submarines built from 1905 to 1917. Beginning in 1909–1910 most larger surface ships began replacing their 6-pounders with 75mm 50 caliber Pattern 1892 and 102mm 60 caliber Pattern 1911 guns when combat experience in the Russo-Japanese war showed the 6-pounders were almost as ineffective as the 3-pounder and 1-pounder guns they had replaced. In 1911–12 a number were turned over to the Army for use as coastal artillery, and later in 1914 some were converted into anti-aircraft guns. In addition to the Hotchkiss guns there were also Nordenfeld Guns which were used as ranging guns for coastal defenses. Finland, a successor state to the Russian Empire, inherited a number of 6-pounders and used them throughout the Winter War and World War II in the coastal artillery role.[8]

Spain adopted both the 40-caliber Hotchkiss 6-pounder and the 42-caliber Nordenfelt 6-pounder in the 1880s to arm its armored cruisers, battleships, protected cruisers and unarmored cruisers. Seven ships (1 battleship, 3 unarmored cruisers and 3 protected cruisers) carried the Hotchkiss guns and eleven (8 unarmored cruisers and 3 protected cruisers) carried the Nordenfelt guns. Ships on both sides of the Spanish–American War were armed with various 6-pounder guns (Driggs-Schroeder, Hotchkiss and Nordenfelt). The Spanish cruiser Isla de Cuba, which was captured by the United States during the Spanish–American War and served as the USS Isla de Cuba until sold to Venezuela in 1912 and renamed Mariscal Sucre, was the last ship decommissioned and scrapped in 1940.

The UK adopted a 40 calibre (i.e. 90 inch barrel) version as Ordnance QF Hotchkiss 6 pounder gun [9] Mk I and Mk II or QF 6 pounder 8 cwt. It was manufactured under licence by the Elswick Ordnance Company. They were originally mounted from 1885 onwards for use against the new (steam-driven) torpedo boats which started to enter service in the late 1870s.

The UK also adopted the competing 42 caliber Ordnance QF 6 pounder Nordenfelt at the same time as the QF 6-pounder Hotchkiss, but the Royal Navy was not satisfied with the special Nordenfelt ammunition and fuzes. Following the explosion in 1900 of an ammunition ship due to defective fuses, Britain replaced Nordenfelt fuzes with the Hotchkiss designs and Nordenfelt guns were phased out in favor of the Hotchkiss guns and were declared obsolete by 1919.[10]

The original 1885 Hotchkiss Mk I was a built-up gun with a barrel, jacket and a locking hoop screwed to the front of the jacket. The Mk I lacked a recoil system, but the Mk II of 1890 introduced a hydraulic recoil mechanism with a pair of hydro-spring cylinders.[11] During World War I the navy required many more guns and an autofretted, mono-block barrel version was developed to simplify manufacture and identified as "6 pdr Single Tube". Initially these guns were only allowed to be fired with a special lower charge, but in 1917 they were relined with A tubes as Mk I+++ which enabled them to use the standard 6-pounder ammunition.[11]

After World War I the gun was considered obsolete for combat use, but continued in use as a saluting gun and as sub-calibre training guns. Of the 3,984 produced it was estimated that 1,640 still existed in 1939.[12] With the onset of World War II the remaining guns were rushed back into service for anti-submarine defense, E-boat defense and for coastal defense. New non-recoil Mk VI, Mk VI* and Mk VI** mountings were built with elevations between -10° to +70°. These mountings were used on early models of the Fairmile D Motor Gunboats, Motor Launches and Flower-class corvettes.[13] Some of which were not re-armed with the modern auto-loading 6 pdr Mk IIA until late 1944.[14]

The 6-pounder was used to equip Male versions of the early British Mk I - Mk III tanks. In 1916 the British Army having no prior experience in fighting tanks was faced with the difficulty of quickly providing a new class of weapon. The existing Hotchkiss 6-pounder naval gun appeared to most closely meet the need (a compact enough weapon to fit into a tank sponson with a sufficient high explosive shell). A single gun was mounted in each sponson, i.e. 2 per Male tank able to fire forwards or to the side. Tanks armed only with machine guns were designated as Female.

The gun turned out to be too long for practical use as the end of the barrel could come into contact with the ground or other obstacles as the tank traveled over uneven ground. The British chose to shorten the gun rather than change its location and replaced it in 1917 in the Mark IV tank onwards by the shorter QF 6 pounder 6 cwt.

Britain lacked any dedicated air-defence artillery early in World War I and up to 72[15] 6-pounders were adapted to high-angle pedestal mountings at key establishments in Britain for close air defence by 1916. They are not listed as still being in service in this role at the end of the war,[12] presumably because German bombing attacks were conducted from relatively high altitudes which would have been beyond the gun's range.

Hotchkiss 6-pounder being prepared to combat at the USS Detroit (L'Univers Illustré, 1894).

The history of the Hotchkiss 6-pounder (called the Rapid Fire gun rather than Quick Firer in the US) in United States Navy and Army service is a complex story. It was used in conjunction with another maker's design, its primary rival being the Driggs-Schroeder 6-pounder. Oddly, one shipbuilding and naval supply company, Cramp & Sons, had a license to build both the Hotchkiss and Driggs-Schroeder and sold both to the Navy in parallel. It appears that Hotchkiss type guns had an edge in production in the first half of the 1890s, but by 1895 Driggs-Schroeders were being produced in quantity to equip a considerable number of newly commissioned ships. The initial purchases by the Navy were in small lots each year and there was no mass-production of these guns like one would see in smaller weapons. The Navy made certain that the ammunition for both the Hotchkiss and Driggs-Schroeder guns were identical.

There is no question that the Driggs-Schroeders were predominant in the new protected and armored cruisers that were being commissioned by 1895. However, USS Texas, a second class battleship commissioned in 1895, carried a mixed 6-pounder complement of ten Driggs-Schroeders and two Hotchkiss guns. USS Maine, an armored cruiser, exclusively carried Driggs-Schroeder 6-pounders although it had a mixed one pounder battery of both Driggs-Schroeder and Hotchkiss. Ships known to have carried exclusively Driggs-Schroeder 6-pounders are USS Olympia, Brooklyn, New York, and Columbia. Although from photographs of particular guns on the vessels in question, it appears that the battleships USS Indiana, USS Oregon, and USS Iowa carried exclusively Hotchkiss 6-pounders with USS Massachusetts carrying Driggs-Schroeders. Unlike her 8-inch guns, the preserved USS Olympia (C-6) retains her Driggs-Schroeder 6-pounders. She is at the Independence Seaport Museum in Philadelphia.

Beginning in 1910 6-pounder guns were replaced by 3"/50 caliber guns aboard US Navy ships.[16] However smaller ships such as US Coast Guard cutters, gunboats and minesweepers continued to use 6-pounders in the years between World War I and World War II.

The US Army also used the Hotchkiss 6-pounder, referred to as a "2.24-inch gun" in some period references. As the primary defender of coastal fortifications and harbors, the US Army had a need for lighter guns to supplement their shore batteries, particularly since land defense against infantry was a consideration in the 1890s.[17] The Army was in an experimental phase like the Navy, testing new weapons in an era when military budgets were expanding after decades of Congressional stinginess.

It appears that the US Army and US Navy, while both using the "Mark" system, assigned their designations to different ordnance. References indicate that Driggs-Schroeder guns, manufactured by the American Ordnance Company and designated Mark II and Mark III, were adopted along with Driggs-Seabury weapons designated M1898 and M1900. In 1898–1901 a total of 97 weapons were acquired: 20 M1898, 40 M1900, 10 Mark II, and 27 Mark III guns. However, 17 M1898 and all ten Mark II guns were transferred for use on Army troop transports in the Spanish–American War of 1898, leaving 70 weapons for land use. The mountings for the Army six pounders were called M1898 and M1898 (modified) "rampart mounts" or "parapet mounts", wheeled carriages with fittings that allowed them to be secured to pintle mounts.[18] Another reference has somewhat different figures.[19] There were generally two of these guns issued per major fort, and eventually many of them became saluting guns at the post's flagpole.[19] A dozen were deployed at Fort Ruger in Hawaii as part of the Land Defense Project of 1915–1919, while others were deployed in the Philippines under this project.[20]