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Mk.II: 1,600 yd (1,500 m) Mk.II LR: 2,800 yd (2,600 m)
The Ordnance ML 3-inch mortar was the United Kingdom's standard mortar used by the British Army from the early 1930s to the late 1960s, superseding the Stokes mortar. Initially handicapped by its short range compared to similar Second World War mortars, improvements of the propellant charges enabled it to be used with great satisfaction by various armies of the British Empire and of the Commonwealth.
The ML 3-inch mortar is a conventional Stokes-type mortar that is muzzle-loaded and drop-fired. It also reuses many of the Brandt mortar features.
Tail unit of Ordnance ML 3-inch mortar bomb fired by the Royal Jordanian Army on 5 June 1967. The ICI made white phosphorus bomb landed in Israeli part of Jerusalem, causing minor damage.
In action in Burma, 1944
Based on their experience in the First World War, the British infantry sought some sort of artillery for close support. The initial plan was for special batteries of artillery, but the cost was prohibitive and the mortar was accepted instead.
Lieutenant General Sir Bernard Paget, C-in-C Home Forces, inspecting a 3-inch mortar crew, 9 January 1943.
The Mark II mortar (Mark I was the Stokes) was adopted by the British Army in the early 1930s; and this was the standard British mortar when the Second World War broke out in September 1939. Experience in the early part of the war showed that, although the Mark II was reliable and sturdy, it did not have sufficient range compared to the German 81 mm s.GW.34 mortar. A series of experiments and trials using new propellants improved the range from 1600 yards to 2800 yards by about 1942; and, by 1943, the barrel, baseplate and sights had also been improved. Although called the '3-inch mortar' by the British Army, its calibre was actually 3.209 in (81.5 mm).