The Sherman Firefly was a World War II British variant of the American Sherman tank, fitted with the powerful British 17 pounder anti-tank gun as its main weapon. Originally conceived as a stopgap until future British tank designs came into service, the Sherman Firefly became the most common vehicle with the 17 pounder in World War II.

Though the British expected to have their own new tank models developed soon, British Major George Brighty championed the already-rejected idea of mounting the 17 pounder in the existing Sherman. With the help of Lieutenant Colonel Witheridge and despite official disapproval, he managed to get the concept accepted. This proved fortuitous, as both the Challenger and Cromwell tank designs experienced difficulties and delays.

After the problem of getting the gun to fit in the Sherman's turret was solved, the Firefly was put into production in early 1944, in time to equip Field Marshal Montgomery's forces for the Normandy landings. It soon became highly valued as the only British tank capable of defeating the Panther and Tiger tanks it faced in Normandy at standard combat ranges. In recognition of this, German tank and anti-tank gun crews were instructed to attack Fireflies first. Between 2100 and 2200 were manufactured before production wound down in 1945.

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29th Armored Brigade, 11th Armored Division, France July 1944.
4th Country of London Yeomanry, 22nd Armoured Brigade, 7th Armoured Division, France June 1944.
144th Regiment of Royal Armoured Corp, 33rd Armoured Brigade, France July 1944.

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