Late in the morning of 10 June 1982, whilst still in position observing across the
Falkland Sound, Duarte thought that he could hear distant voices being carried upon the wind, emanating from some way further along the ridge. Summoning his patrol together he moved along the ridge-line, continuing to hear snatches of voices apparently in conversation with one another, until he came to a cluster of cave-shaped rocks, wherein he suspected that either a British military presence was hidden in situ, or possibly that it might be a weather-shelter for some Falklander shepherds. As they approached the rock formation a man with a dark skin complexion and a large moustache (
Cpl. Roy Fonseka,
Royal Signals attached to the Special Air Service, who was of
Seychellois origin), wearing a camouflage uniform and a green
balaclava suddenly walked out from amidst it into the open ground, unaware of the commandos' presence and looking away in another direction. Initially, the Argentinians hesitated as the balaclava resembled the ones issued to their own forces, and Duarte shouted a challenge: "
Argentinos o Ingleses?" (
Argentine or English?), at which Fonseka turned towards him and stopped dead, staring at him as if stunned and failed to respond. After a short silence, Lt. Duarte yelled in English: "Hands up, hands up!". In response to this Fonseka suddenly dropped to the ground, and producing a weapon opened fire at Duarte, which struck the rocks in front of him as he ducked for cover, briefly blinding him with rock dust. As the commandos scrambled to get into covered firing positions Fonseka leapt up and ran back into the rocks from where he had emerged, and a general small-arms fire-fight commenced between the 4 Argentinians and the 2-man British Army forward observation post that they had discovered. During the engagement Sergeant Eusebio Moreno threw two grenades at the British post, and received in reply a British 40 mm grenade, which exploded a few yards to the rear, and Hamilton, firing at the commandos from within the post alongside Fonseka, was struck in the arm by a bullet. Under the weight of fire from Duarte's patrol, the British two-man team attempted to abandon the position and retire up the short stretch of ridgeline to their rear in order to gain the high ground and access to the ridge's reverse slope beyond the summit, with Capt. Hamilton ordering Fonseka to fall-back as a first move whilst he covered him with automatic fire. However, as it was underway and Fonseka was heading up the slope Hamilton was struck again by rifle fire from Lt. Duarte and killed whilst himself exiting the post, and Fonseka surrendered shortly afterwards and was taken
prisoner of war. Although Hamilton wore no rank or insignia (as is SAS practice), he was identified by his
dog tag. Also found in the captured observation post was a radio, an
M16 and an
AR-15 rifle, a
beacon, maps and a communications code book. Another two men who were a part of Hamilton's patrol, but weren't in the attacked post at the time, withdrew from the area and were later rescued by British Forces. ==Subsequent events==