On 14 May the SAS carried out a raid on Pebble Island on the Falklands, where the Argentine Navy had taken over a grass airstrip for FMA IA 58 Pucará light ground-attack aircraft and Beechcraft T-34 Mentors, which resulted in the destruction of several aircraft.
During the night of 21 May, the British Amphibious Task Group under the command of Commodore Michael Clapp (Commodore, Amphibious Warfare – COMAW) mounted Operation Sutton, the amphibious landing on beaches around San Carlos Water, on the northwestern coast of East Falkland facing onto Falkland Sound.
By 1 June, with the arrival of a further 5,000 British troops of the 5th Infantry Brigade, the new British divisional commander, Major General Jeremy Moore RM, had sufficient force to start planning an offensive against Stanley.
Plans were drawn up for half the Welsh Guards to march light on the night of 2 June, whilst the Scots Guards and the second half of the Welsh Guards were to be ferried from San Carlos Water in the Landing Ship Logistics (LSL) Sir Tristram and the landing platform dock (LPD) Intrepid on the night of 5 June.
On the night of 11 June, after several days of painstaking reconnaissance and logistic build-up, British forces launched a brigade-sized night attack against the heavily defended ring of high ground surrounding Stanley. Units of 3 Commando Brigade, supported by naval gunfire from several Royal Navy ships, simultaneously attacked in the Battle of Mount Harriet, Battle of Two Sisters, and Battle of Mount Longdon.