BL 6-inch 30 cwt howitzer

The Ordnance BL 6 inch 30cwt howitzer was a British medium howitzer used in the Second Boer War and early in World War I. The qualifier "30cwt" refers to the weight of the barrel and breech together which weighed 30 hundredweight (cwt) : 30 × 112 lb = 3,360 lb. It can be identified by the slightly flared shape of the muzzle and large recuperator springs below the barrel.

BL 6 inch 30 cwt Howitzer
With breech open, circa. 1900
TypeMedium howitzer
Place of originUnited Kingdom
Service history
In service1896 - 1918
WarsSecond Boer War
World War I
Greco-Turkish War (1919–1922)
Production history
No. built120
Specifications
Mass7733lb (3507kg) [1]
Crew10
ShellLyddite : 122 lb 9 oz (55.59 kg),[2] later 100 lb (45.36 kg);[3]
Shrapnel : 100 lb (45.36 kg)
Calibre6-inch (152.4 mm)
RecoilHydro spring, 18 inch[4]
CarriageWheeled, box trail
Elevation-10° - 35° (wheeled carriage)
35° - 70° (siege mount)[4]
Muzzle velocity777 ft/s (237 m/s) [4]
Maximum firing range5,200 yds (122lb 9oz shell, on wheeled travelling carriage); 7,000 yds (122lb 9oz shell, on siege mounting)
7,000 yards (100 lb shell, on wheeled travelling carriage)[5]

History

Introduced 1896, based on an Indian Army design.

Its original shell was 122 pounds 9 ounces (55.6 kg) Lyddite explosive. In 1901 a lighter 100 lb (45 kg) shell was introduced which increased maximum range when firing from its wheeled travelling carriage to 7000 yards.[6] These were then referred to as the "heavy" and "light" shell respectively. A 100 lb shrapnel shell was also available.

It was phased out and replaced by 6 inch 26 cwt howitzer from late 1915 onwards. Also, in 1915 it received barrel, breechlock, recoil system and ammunition upgrade increasing its maximum range to 10400m (8400m with standard ammunition).(See specifications)

Combat use
On siege mounting

This gun was designed as a siege howitzer firing a special 122 pounds 9 ounces (55.59 kg) howitzer shell. It was designed to be fired from a static siege platform, with wheels removed, for accurate long-range shooting. When fired mounted on its normal wheeled travelling carriage, which had become standard practice for modern medium artillery, its range and accuracy diminished due to limited elevation and also lack of a modern recoil mechanism.

Second Boer War
In South Africa, Second Boer War

Twelve guns were employed in South Africa in the Second Boer War as part of the British siege train. It was during this campaign that the short range limitation became evident, and shell weight was traded for greater range in 1901 with the introduction of a "light" 100 pounds (45.36 kg) shell which increased maximum range when firing from its wheeled travelling carriage to 7000 yards. No use was found for the siege platform which allowed elevation to 70°: ”This capability was designed for distinct siege operation, and in South Africa the need for this did not arise. In this theatre the platform was an encumbrance, and it was discovered that it could be dispensed with.”[6]

World War I
Gun landing at Anzac Cove, Gallipoli, 1915

When World War I began approximately 80 guns were still available. They constituted the only true heavy artillery the British army possessed, and were heavily engaged in the early battles in France and Flanders. It was adapted to use the standard 100 pounds (45.36 kg) gun shell, with a slight enlargement of the chamber to produce Mk I*, allowing slightly larger propellant charges.[7] It served in all theatres, including the Western Front, until replaced by the modern 6 inch 26 cwt howitzer from late 1915. At Gallipoli, where there was a lower priority for modern ordnance, the 6 inch 30 cwt was used at Helles by 14th Siege Battery RGA (4 guns), attached to 29th Division, and at Anzac by the Australian 1st Heavy Artillery Battery (2 guns from the Royal Malta Artillery, crewed by the Royal Marine Artillery, which arrived in May).[8]

In Greek Service (1917–1941)
Gun in Greek service during the war against Turkey

The BL 6-inch 30 cwt howitzer entered service with the Greek Army in late 1917, when due to shortage and obsoleteness of Greek howitzers, the British Army transferred 40 pieces to the National Defence Army Corps, which was operating in the Macedonian front. These pieces made up for a full Howitzer Regiment of 36 guns, composed of 3 squadrons and 3 batteries (4 guns) each, which saw action during the closing phases of the war and the Macedonian Front breakthrough.

During the Greco-Turkish War (1919-1922), the Howitzer Regiment dispatched a 155 mm (sic) Howitzer Squadron from 1919 to early 1922, which was used as Army Reserve Artillery. After February 1922, the Howitzer Regiment was fully deployed in Asia Minor, but its 9 batteries were being mainly used to reinforce divisional artillery in the front sectors that were deemed dangerous for a turkish breakthrough.

The BL 6-inch 30 cwt howitzer continued to serve in the Greek Artillery for another 18 years, but from 1932 it was already rendered "obsolete" and in need of "extensive repairs to return to operational status". Despite this, at least 16 pieces were deployed behind the "Metaxas Line" along the Greco-Bulgarian border in late 1939 and participated in the desperate battle against the invading German Army from 6 to 9 April 1941.

World War I ammunition
2 lb 8½ oz cordite cartridge for "light" (100 lb) shell, showing arrangement of cordite rings around central core.
One or more rings were removed for shorter ranges.
Mk I 100-lb "light" lyddite shell
No 17 D.A. percussion fuze for lydditte shells
Star shell
Mk IX 100 lb shrapnel shell for gun or howitzer (1 inch G.S. fuze gauge)
Mk I 100 lb "light" shrapnel shell for howitzer (2 inch fuze gauge)
Mk IV T friction tube

Operators

See also

Weapons of comparable role, performance and era

Surviving examples
Gun at the Imperial War Museum Duxford
Gun at the War Museum of Thessaloniki, Greece

Notes and references
  1. Hogg, Ian. Twentieth-Century Artillery. New York: Barnes & Noble Books, 2000. ISBN 0-7607-1994-2 Pg.61
  2. Text Book of Gunnery 1902, Table XII Page 336
  3. Treatise on Ammunition, 10th Edition, 1915
  4. Hogg & Thurston 1972, page 125
  5. Clarke 2005, page 20
  6. Hall June 1972
  7. Treatise on Ammunition, 1915. Page 95. War Office.
  8. CEW Bean,"THE OFFICIAL HISTORY OF AUSTRALIA IN THE WAR OF 1914-1918 Volume II" page 80. 11th Edition, published by Angus & Robertson, Sydney, 1941

Bibliography

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