The Firefly was arguably the best variant of the Sherman to see service during the Second World War. Armed with the legendary 17-pdr gun, it gave the British and Commonwealth tankers the ability to knock out even the most formidable tanks available to the Wehrmacht, such as the Tiger or Panther.
The original Firefly VC was a conversion of the M4A4 Sherman, or Sherman V (the British designation for the M4A4); the C was the British designation for a tank armed with a 17-pdr gun. But with M4A4 production halting in 1943, the M4 Sherman or Sherman I was chosen to supplement the dwindling stocks of Firefly VCs.
As the war went on, the Firefly IC began to overtake the VC as the most numerous version of the up-gunned Sherman.