For the Normandy landings, the Royal Marine Armoured Support Group was formed with an establishment of eighty Mark IVs.

Perhaps in response to the success of the German sIG 33, a proposal was circulated in the summer of 1942 by the British Army for an infantry howitzer for direct fire against concrete structures, like pillboxes.

The problems with the recoil mechanism and carriage were never fully corrected and the weapon was refused by the infantry and declared obsolete in April 1945 after several hundred examples were produced.

[8] The decision to reject the infantry howitzer may not have been based entirely on the deficiencies of the gun but due to obsolescence and organisational difficulties.

The introduction of the bazooka and recoilless rifles, such as the Burney 3.45-in, may have influenced the decision to refuse the gun since they were lighter, less expensive, portable and fulfilled the direct fire use of the infantry howitzer.