Carlos Water, (Blue Beach) at 03:30. They then secured the high ground of the Sussex Mountains, establishing a reverse slope defence. Meanwhile, the landing craft returned to take 45 Commando from Intrepid and Stromness to Ajax Bay (Red Beach), and 3 Para from Intrepid to Port San Carlos (Green Beach). 42 Commando remained on Canberra as a reserve. Delays in landing the first wave meant that the second was about two hours late, with 3 Para landing at 07:30. Build-up Daylight allowed helicopter operations to begin. On 21 May, helicopters carried 288 loads, moving 520 personnel and of stores from 11 ships to 21 sites. STUFT were unloaded at a rate of per hour, and the LSLs could be unloaded at per hour, the lesson being that STUFT were a poor substitute for purpose-built amphibious vessels. Priority was given to moving the six L118 light guns of 79 Commando Battery, 29th Commando Regiment Royal Artillery, ashore. Moving a battery with 500 rounds per gun required 85 Sea King sorties. The next priority was to position the Rapiers of T battery, but owing to the delays in the landing, the Rapier sites were not secured until around midday. Generally located on hilltops where there were no roads or tracks, the Rapiers had to be sited by helicopter. If they had to be moved, whether yards or miles, another helicopter sortie was called for. No one knew for certain what the effect of seven weeks' sea voyage would be on the equipment, but the need for air defence was obvious, as the Argentine air forces made repeated attacks on ships in Falkland Sound. Two Gazelle helicopters were lost. Of the seven escorts, five, , , , and , were hit; only and were unscathed. Of those hit, only Broadsword was fully capable of continuing the fight, while Ardent was ablaze and sinking. Clapp decided that the sound was too dangerous for STUFT, and ordered that Canberra, Norland and Europic Ferry leave Falkland Sound by midnight. The LSLs remained, but on 23 May Argentine bombs found Sir Bedivere, Sir Galahad and Sir Lancelot. None of those that struck the LSLs exploded. Damage to Sir Bedivere was minor, but Sir Galahad was set on fire and beached, and was put out of action for a week. Fires started on Sir Lancelot, which put it out of action until 7 June—although in the meantime she