Sherman or Firefly? Here is a guide to the Sherman Firefly!!



The Sherman Firefly was a World War II British variant of the 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. Three different variants of Sherman Firefly served during the Second World War, each based on different variants of the M4 Sherman. The Firefly conversion was carried out on Sherman I (M4), Sherman I Hybrid (M4 Composite) and Sherman V (M4A4) tanks. Some sources state that several Sherman IIs (M4A1) were converted and used in action, but photos allegedly showing these conversions are in fact views of the front half of Sherman I Hybrid Fireflies (source : Wikipedia) Thanks to our friends at

US designationBritish designation
M4 ShermanSherman Ic
M4 Composite Sherman      Sherman Ic Hybrid
M4A4 ShermanSherman Vc

Note : the letter ” c ” at the end of the British designation indicates a vehicle equipped with a 17 Pdr main gun (a British M4A4 with a 75mm main gun is a Sherman V)A very small number of Canadian licence-built Sherman IIs (M4A1), the Grizzly, were converted to Fireflies in Canada and used for training, but none saw action (source : Wikipedia)




The hull
The Sherman Firefly hull included at the same time some improvements that were applied to all British Sherman tanks, and some improvements that were specific to the Firefly tanks.The major changes, which are features that help to easily recognize a Firefly tank from a normal Sherman, are the elimination of the hull bow machine gun, which was covered with an armour plate, and the addition of a gun travel lock at the back of the hull, to allow the tank to move with the barrel turned back.

Other changes that are common to the Firefly and British Shermans are :
-fittings for additional tracks, that can be placed either on the front or sides of the hull
-fire extinguishers clamps, located at the back of the hull, beside the engine deck plates
-an additional large box to the back of the hull
-smoke generators placed on the back engine doors
-mounts for a leaf spring that held the towing pintle
-additional towing lugs, fitted for lashing down to landing craft when deep wading trunking is fitted (as this item obscured the original towing eyes)
(Information from Kurt Laughlin and Adrian Barrel)

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The left-side photo above shows the fittings for additional tracks, while the right-side photo shows one of the two fire extinguisher clamps and the additional gun travel lock

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The left-side photo above shows a fire extinguisher clamp (#1), the additional gun travel lock (#2) and the fittings for the additional box (#3).
The right-side photo shows the smoke generator (#1), the mounts for a leaf spring that held the towing pintle (#2) and one of the additional towing lugs (#3).

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Two photos showing differrent models of armour plates that cover the bow machine gun. This piece of armour was welded to the hull, because the hull gunner was eliminated to get more room for additional 17 pounder ammunition, which was significantly longer than the 75 mm shell and thus took up more space.