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'X-Ray' Company would assault the lower ridges of the southern peak ('Long Toenail') of Two Sisters from the west, 'Zulu' Company would attack the northern peak, known in 45 Commando as 'Summer Days', and 'Yankee' Company would then assault the eastern ridge. The local commander on the Two Sisters ridge was Major Ricardo Mario Cordón, second-in-command of the 4th 'Monte Caseros' Infantry Regiment.

'X-Ray' Company would assault the lower ridges of the southern peak ('Long Toenail') of Two Sisters from the west, 'Zulu' Company would attack the northern peak, known in 45 Commando as 'Summer Days', and 'Yankee' Company would then assault the eastern ridge. The local commander on the Two Sisters ridge was Major Ricardo Mario Cordón, second-in-command of the 4th 'Monte Caseros' Infantry Regiment.

The first attack against 'Long Toenail' came in around 11.00 PM Falklands time and Lieutenant David Stewart's 3 Troop – a Royal Marine Troop is like an Army Platoon – managed to get very close to 2d Lieutenant  Marcelo Llambías-Pravaz's 3rd Platoon, 'C' Company, 4th Regiment. But the attack was beaten off by rifle and machine-gun fire. Second Lieutenant Llambias-Pravaz rallied his men with the old Guarani Indian war-cry of 'Sapukay!' The Royal Marine Commandos in 'X' Company pushed hard when prudent, but avoided rash moves.

The first attack against 'Long Toenail' came in around 11.00 PM Falklands time and Lieutenant David Stewart's 3 Troop – a Royal Marine Troop is like an Army Platoon – managed to get very close to 2d Lieutenant  Marcelo Llambías-Pravaz's 3rd Platoon, 'C' Company, 4th Regiment. But the attack was beaten off by rifle and machine-gun fire. Second Lieutenant Llambias-Pravaz rallied his men with the old Guarani Indian war-cry of 'Sapukay!' The Royal Marine Commandos in 'X-Ray' Company pushed hard when prudent, but avoided rash moves.

The Argentine conscripts on 'Long Toenail' stood to their machineguns and Instalaza anti-tank rocket launchers and defied the attackers with fixed bayonets. Lieutenant Stewart's men flung themselves again at the Argentinians but, were driven off much to the frustration of Captain Gardiner. Despite this, some Argentinians had to pull in a bit or be overrun. The combat was extremely rough being fought in cold wind over a bare rocky ridge and around huge boulders.

The Argentine conscripts on 'Long Toenail' under Corporals Raúl Héctor Peña, Raúl Ramos, Walter Ariel Pintos and Jorge Omar Valdez stood to their machineguns and Instalaza anti-tank rocket launchers and defied the attackers with fixed bayonets. Lieutenant Stewart's men flung themselves again at the Argentinians but, were driven off much to the frustration of Captain Gardiner. Despite this, some Argentinians had to pull in a bit or be overrun. The combat was extremely rough being fought in cold wind over a bare rocky ridge and around huge boulders.

Eventually, at 2.45 AM, the Argentinians had to retreat. After nearly 4 hours of chaotic night fighting the men of 3rd Platoon fell back from 'Long Toenail'.

Eventually, at 2.45 AM, the sections under Corporals Peña, Ramos, Pintos and Valdez had to retreat. After nearly 4 hours of chaotic night fighting the men of 3rd Platoon fell back from 'Long Toenail'.

The great fight in and around the southern peak had cost Llambías-Pravaz's 3rd Platoon 5 killed and 16 wounded, including his platoon sergeant. The assault on the southern peak was supported by 40 Commando's Anti-Tank Troop and innumerable 66mm LAW anti-tank rockets. 'X Ray' Company found the Milan missiles to be a very effective way of dislodging Llambías-Pravaz's defiant 3rd Platoon, but expensive at 35,000 US dollars each. 2d Lt Llambías-Pravaz was one of the recent April 1982 graduates from the Army Academy. His outstanding courage was recognized by the award of the Gallantry in Combat Medal.

The great fight in and around the southern peak had cost Llambías-Pravaz's 3rd Platoon 5 killed and 16 wounded, including his platoon sergeant. The assault on the southern peak was supported by 40 Commando's Anti-Tank Troop and innumerable 66mm LAW anti-tank rockets. 'X Ray' Company found the Milan missiles to be a very effective way of dislodging Llambías-Pravaz's defiant 3rd Platoon, but expensive at 35,000 US dollars each. 2d Lt Llambías-Pravaz was one of the recent April 1982 graduates from the Army Academy. His outstanding courage was recognized by the award of the Gallantry in Combat Medal.

The 3rd Artillery Group's pack howitzers and Major Oscar Jaimet's heavy mortars were brought into play, giving the 4th Regiment's 'C' Company effective support. In this way 45 Commando began to suffer serious losses, including the loss of two platoon commanders (Lieutenants Dunning and Davies) and the naval gunfire liaison officer of the British cruiser 'Glamorgan'. The whole operation was proving to be a disaster.

The 3rd Artillery Group's pack howitzers and Major Oscar Jaimet's heavy mortars were brought into play, giving the 4th Regiment's 'C' Company effective support. In this way 45 Commando began to suffer serious losses, including the loss of two platoon commanders (Lieutenants Dunning and Davies) and the naval gunfire liaison officer of the British cruiser 'Glamorgan'. The whole operation was proving to be a disaster.

Then to the astonishment of the Argentinians on the northern peak, 'Zulu' Company, below, at about 02.30 local time rose, charging with fixed bayonets and screaming at the top of their voices swept the defenders aside. Lieutenant Clive Dytor, commander of 8 Troop, 'Z' Company had tipped the scales and defeated Major Ricardo Cordón. At about 0300 Major Cordón and his staff threw up their arms when Royal Marines entered their bunker. Had Lieutenant Clive Dytor dithered in closing with and defeating Perez-Grandi's 2nd Platoon, 'Summer Days' would have perhaps been reinforced in time by the 6th 'Mercedes' Regiment's 'B' Company which was currently preparing. Commando-trained Major Oscar Ramón Jaimet was naturally anxious to help Major Cordón.  This would have changed the picture of the Battle for Two Sisters Mountain completely.

Then to the astonishment of the Argentinians on the northern peak, 'Zulu' Company, below, at about 02.30 local time rose, charging with fixed bayonets and screaming at the top of their voices swept the defenders aside. Lieutenant Clive Dytor, commander of 8 Troop, 'Zulu' Company had tipped the scales and defeated Major Ricardo Cordón. At about 0300 Major Cordón and his staff threw up their arms when Royal Marines entered their bunker. Had Lieutenant Clive Dytor dithered in closing with and defeating Perez-Grandi's 2nd Platoon, 'Summer Days' would have perhaps been reinforced in time by the 6th 'Mercedes' Regiment's 'B' Company which was currently preparing. Commando-trained Major Oscar Ramón Jaimet was naturally anxious to help Major Cordón.  This would have changed the picture of the Battle for Two Sisters Mountain completely.

The task of ridding the 6th 'Mercedes' Mechanized Infantry Regiment's 'B' Company remained. On the eastern ridge the fighting was equally tough.  The defenders brought down heavy machine-gun fire and mortar fire on 'Yankee' Company. Private Oscar Ismael Poltronieri, as a machine-gunner found himself very busy indeed. Part of his citation for the Heroic Valour Cross, the highest decoration for bravery, reads:{{cquote|Always volunteering for dangerous missions, manning a machine-gun, holding up attacks, always the last man to withdraw, sometimes overrun by the English, twice given up for dead but always returning to his platoon.<ref>The Fight for the Malvinas: The Argentine Forces in the Falklands War, Martin Middlebrook, p. 239, Viking, 1989</ref>}}

The task of ridding the 6th 'Mercedes' Mechanized Infantry Regiment's 'B' Company remained. On the eastern ridge the fighting was equally tough.  The defenders brought down heavy machine-gun fire and mortar fire on 'Yankee' Company. Private Oscar Ismael Poltronieri, as a machine-gunner found himself very busy indeed. Part of his citation for the Heroic Valour Cross, the highest decoration for bravery, reads:{{cquote|Always volunteering for dangerous missions, manning a machine-gun, holding up attacks, always the last man to withdraw, sometimes overrun by the English, twice given up for dead but always returning to his platoon.<ref>The Fight for the Malvinas: The Argentine Forces in the Falklands War, Martin Middlebrook, p. 239, Viking, 1989</ref>}}