During the Irish Civil War thirteen Rolls-Royce armoured cars armed with Vickers .303 machine guns. were handed over to the Irish National Army by the British government. All were in service with the Irish Defence Forces up until 1944 and withdrawn because the supply of tyres was exhausted. The Defence Forces has preserved one Rolls-Royce armoured car named 'Sliabh na mBan', as it was believed to be the actual Rolls-Royce that accompanied Michael Collins's convoy when he was killed.