Soviet T-54 tanks served in combat during the Hungarian Revolution in 1956 and a few were successfully knocked out by the defending anti-Soviet Hungarian resistance-fighters and rebels using Molotov cocktails and several anti-tank guns. The local anti-communist revolutionaries delivered one captured T-54A to the British Embassy in Budapest, the analyses and studies of which helped and spurred the development of the Royal Ordnance L7 105 mm tank gun.