As part of the British plan for the Battle of Mount Tumbledown, the 1st Battalion the 7th Gurkha Rifles (1/7 GR) was given the task of capturing the sub-hill of Mount William held by O Company, the 5th Marine Battalion's reserve, and then allow the Royal Marines under the command of the Welsh Guards through to seize Sapper Hill, the final obstacle before Stanley. The attacks were supported by naval gunfire from HMS Active. During the initial assault, Royal Marines from C company, 40 Commando were inserted close to the Argentine position by helicopter and immediately began an assault using General Purpose Machine Guns and 66mm anti-tank rockets.