BL 60-pounder

BL 60-pounder
Name	BL 60-pounder
Type	Heavy field gun
Origin	United Kingdom
In service	1905–1945
Manufacturer	Elswick Ordnance Company, Armstrong Whitworth, Royal Ordnance Factory
Weight	4.5 tons (approx.)
Caliber	5 in (127 mm)
Cartridge	60 lb shell
Range	10,000–12,300 yd
Breech	Welin interrupted screw
Recoil	Hydro-spring

BL 60-pounder The BL 60-pounder was a British heavy field gun introduced in the early 20th century and used extensively in the First World War and the Second World War. It served with the Royal Artillery, Territorial Force, and with Commonwealth forces in numerous campaigns, and influenced later designs by manufacturers such as Vickers, William Armstrong Ltd., and Royal Ordnance Factory. The gun saw action on battlefields including the Western Front, the Gallipoli campaign, and the North African Campaign.

Development and Design

Designed to meet requirements set by the War Office and tested alongside systems from Vickers and Elswick Ordnance Company, the gun originated in trials influenced by lessons from the Second Boer War and the Russo-Japanese War. Designers incorporated innovations from engineers like those at Welin, Crusader Works, and Armstrong Whitworth to produce a weapon with a Welin interrupted-screw breech, a hydro-spring recoil system, and a split trail carriage adopted later to improve traverse and depression. The development process involved collaboration between the Royal Gun Factory, private contractors, and the Admiralty for component standardisation, and drew on field evaluations by units such as the Royal Horse Artillery and divisions within the British Expeditionary Force.

Technical Specifications

The gun fired a 60-pound (27.2 kg) projectile from a 127 mm (5 in) calibre barrel with a typical barrel length of around 40 calibres; it used a Welin interrupted screw breech and separate-loading ammunition. Carriage types included a box trail and later split trail conversions incorporating variable recoil lengths similar to mechanisms used by French Army designs and by US Ordnance practices. Mobility was provided by horse teams and later by traction from Royal Army Service Corps tractors and Morris Commercial vehicles; deployment included limbering procedures used by Field Artillery Brigades and emplacement tactics comparable to those at Amiens and Passchendaele.

Service History

Introduced in 1905, the gun equipped heavy batteries of the Royal Garrison Artillery and was mobilised with the British Expeditionary Force in 1914. It provided counter-battery fire during fights at Ypres, The Somme, and during the Battle of Arras, and later supported operations in the Italian Front and in the Salonika Campaign. Interwar units retained examples in Territorial formations that served in the Battle of France and in North Africa in campaigns such as Operation Compass and El Alamein. In the Second World War the weapon remained in secondary theatres and training units while newer guns like the 25-pounder and 4.5-inch Medium Gun replaced it in front-line service.

Ammunition and Ballistics

Ammunition types included high-explosive, shrapnel, and smoke rounds, with fuze options similar to those used by Royal Artillery ordnance and procedures promulgated by the War Office. Effective ranges varied with charge and projectile type, commonly cited between 10,000 and 12,300 yards, and ballistic performance was assessed in range tables alongside weapons such as the French 155 mm and the German 15 cm SK L/40. Ballistics studies by organisations like the Ballistics Research Laboratory and trials at ranges used by the Ordnance Committee informed fire-control methods, including predicted two-stage charges, corrected elevation for temperature, and use of spotting from Airco DH.4 and later from RAF reconnaissance.

Variants and Modifications

Variants included early Mk I and later Mk II/III patterns with changes to barrel length, rifling, and carriage. Modifications during the First World War and interwar years produced versions with improved recoil, split trail conversions for increased traverse, and mounting adaptations for static coastal roles akin to conversions performed on other British ordnance at Chatham Dockyard and Woolwich Arsenal. Some pieces were rechambered or fitted with pneumatic tyres for motor traction in the 1930s following experiments similar to those by Royal Ordnance Factory Woolwich engineers and workshops at Enfield.

Operators and Deployments

Primary operators were units of the United Kingdom, notably the Royal Artillery and Territorial units, with Commonwealth users including Australia, Canada, South Africa, and New Zealand. Export or lend-lease and battlefield captures put guns into use by secondary operators in theatres involving Ottoman Empire forces, and later captured examples were operated by units within the Wehrmacht and by colonial garrisons in India and the Palestine Mandate. Deployments ranged from static coastal defence in Home Guard arrangements to mobile heavy batteries supporting infantry in combined operations with formations like the Indian Army and Australian Imperial Force.

Surviving Examples and Preservation

Surviving examples are preserved in museums and memorials such as the Imperial War Museum, the Royal Artillery Museum, local regimental museums including Canadian War Museum collections, and static displays at battle memorials for Ypres and Gallipoli. Restoration projects have been undertaken by volunteer groups affiliated with organisations like the National Army Museum and regional trusts at former ordnance depots such as Dover and Portsmouth, where conserved pieces are interpreted alongside archives from the War Office and technical drawings from Armstrong Whitworth.

Category:Field guns of the United Kingdom Category:Artillery of World War I Category:Artillery of World War II