Unlike its French ally, the British Army were deliberately planning for the role of a light field howitzer in their modern war tactical theories. This mission was given to the 'BL 5 inches field howitzer' until 1908, when these obsolete equipments were replaced by quick firing light field howitzers 'QF 4.5 inches field Howitzer', that were used until 1944.

The specification and design of that piece was done on the basis of German 120 mm Krupp howitzers captured in South Africa during the Boers war. The Coventry Ordnance Works proposed a rather original solution, including a hydromecanical recuperator with variable recoil (decreasing with the high elevations), a polygonal section trail with a inner void to allow a large vertical angles range, and a sliding breechblock (unusual in Great Britain). That breech was to be the weak point of the first equipments, and its reinforcement was the base of the 1917 Mk II.

1182 such howitzers were produced before August 1914, and another 3177 new ones were produced during the war. They equipped most of the British Empire armies (Great Britain, Canada, New Zealand, India). 400 pieces were also delivered to Russia.

Main characteristics :

• Weight in firing position : 1370 kg
• Calibre : 114.3 mm (4.5 in.)
• Tube length : 15.6 calibres
• Poids du projectile : 15.9 kg
• Initial velocity : 313 m/s
• Maximum range : 6400 / 7500 m
• Elevation range : -5 / +45 degrees
• Direction range : 6 degrees total range