| Year | March 1944 |
| Vehicle Type | Medium Tank |
| Origin & Designer | USA/Royal Ordnance Factories |
| Numbers Produced | 2.246 (All Models) |
| Crew | 4 (Commander/Gunner, Loader, Radio Operator & Driver) |
| Main Armament | 1 x OQF 17 pdr L/55 Mk. IV Gun |
| Main Armament | [@sponson_traverse] |
| Elevation | -5° to +20° |
| Turret Traverse | 360° (Powered) |
| Gun Traverse | [@gun_traverse] |
| Gun Mount | [@gun_mounts] |
| Maximum Range | [@maximum_range] |
| Armour Penetration | [@armour_penetration] |
| Gun Sight | No. 43 ML Mk. III |
| Secondary Armament | 1 x 7.62mm Browning M1919 Machine Gun (Coaxial) |
| Smoke Discharger | [@smoke_discharger] |
| Ammunition Carried | 77 x 76.2mm Rounds + 5000 x .7.62mm Rounds |
| Height | 2.74m |
| Width | 2.67m |
| Length | 7.85m |
| Combat Weight | 32.700 kg |
| Ground Clearance | 0.43m |
| Fording Depth | 1.0m |
| Trench Crossing | 2.30m |
| Obstacle Clearance | 0.61m |
| Climbing Ability | 31° |
| Radio | No. 19 Set |
| Armour | Hull Front: 51mm. Hull Sides: 38mm. Hull Rear: 38mm. Hull Top: 25mm. Hull Bottom: 13mm. Gun Mantlet: 89mm. Turret Front: 76mm. Turret Sides: 51mm. Turret Rear: 64mm. Turret Top: 25mm. |
| Engine | Chrysler Multibank A57 (Petrol) |
| Transmission | 5 Forward & 1 Reverse |
| Maximum Road Range | 161 km |
| Maximum Cross Country Range | [@maximum_cross_country_range] |
| Maximum Water Range | [@maximum_water_range] |
| Maximum Road Speed | 40 kph |
| Maximum Cross Country Speed | 28 kph |
| Maximum Water Speed | [@maximum_water_speed] |
| Variants | Sherman Firefly VC (M4A4) Sherman IC Firefly (Welded hull and cast turret) Sherman Firefly Hybrid IC (Cast hull and turret) |
| Notes | The British military desperately needed a tank to allow their armored units to be able to engage German tanks at ranges over 1000m, so they merged the 17 pdr with stocks of Sherman M4s, this initially caused problems due to the size of the turret, the gun breech was rotated so that the gun could be loaded from the side, the turret radio had to be placed in an armoured box located at the turret rear, a new hatch was cut in the turret to allow for the Gunner or loader to escape and finally the hull machine gunner was omitted and extra ammunition racks added. The Firefly was first used in Normandy. They were issued at one per troop of Sherman’s giving the troop three Sherman’s and one Firefly. |