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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 liason 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 liason 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 been instrumental in rousing the Royal Marines and had tipped the scales and defeated Major Ricardo Cordon. At about 0300 Major Cordon and his staff threw up their arms when Royal Marines entered their bunker.

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 Cordon. At about 0300 Major Cordon 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 most probably been reinforced in time by the 6th 'Mercedes' Regiment's 'B' Company which was currently preparing. Commando-trained Major Oscar Ramon Jaimet was naturally anxious to help Major Cordon.  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>}}

Major Oscar Jaimet was confident of holding the British thrust, now coming from the northern peak. During the advance on the eastern ridge 'Yankee' Company destroyed a 6th Regiment machine-gun post, killing the crew, somehow avoiding the booby-traps laid by the 1st Amphibious Engineer Company. A counterattack at the 10th Mechanized Infantry Brigade Headquarters in Stanley House was contemplated but rejected.  Then Jaimet received orders at 0445 to abandon the ridge and retire to Tumbledown Mountain. With the breach on Two Sisters Mountain, where Major Ricardo Cordon's company was supposed to be, the 6th Regiment company had no option but to withdraw with dawn fast approaching.  2d Lieutenant Aldo Eugenio Franco's platoon formed the rearguard and it filed off, leaving three killed. Time and time again 2d Lt. Franco - he became an Army commando after the war - reported his platoon could hold, but was ordered to abandon Two Sisters.

Major Oscar Jaimet was confident of holding the British thrust, now coming from the northern peak. During the advance on the eastern ridge 'Yankee' Company destroyed a 6th Regiment machine-gun post, killing the crew, somehow avoiding the booby-traps laid by the 1st Amphibious Engineer Company. A counterattack at the 10th Mechanized Infantry Brigade Headquarters in Stanley House was contemplated but rejected.  Then Jaimet received orders at 0445 to abandon the ridge and retire to Tumbledown Mountain. With the breach on Two Sisters Mountain, where Major Ricardo Cordon's company was supposed to be, the 6th Regiment company had no option but to withdraw with dawn fast approaching.  2d Lieutenant Aldo Eugenio Franco's platoon formed the rearguard and it filed off, leaving three killed. Time and time again 2d Lt. Franco - he became an Army commando after the war - reported his platoon could hold, but was ordered to abandon Two Sisters.

45 Commando's losses were 8 dead and 19 wounded.  The Argentine losses were put at 20 dead.  2d Lieutenant Miguel Mosquera was wounded during the fighting on the northern peak.  Lieutenant Luis Carlos Martella on 'Long Toenail' was killed. Second Lieutenant Perez-Grandi was also down. His conscripts carried him away, severely wounded. Perez-Grandi had spent a year in the 4th Airborne Artillery Group as a conscript before entering the Buenos Aires Army Academy.

So ended the Battle for Two Sisters Mountain, five hours after 'X' Company came under heavy fire from 2d Lt Llambias-Pravaz's platoon on 'Long Toenail'. 45 Commando's losses were 8 dead and 19 wounded.  The Argentine losses were put at 20 dead.  2d Lieutenant Miguel Mosquera was wounded during the fighting on the northern peak.  Lieutenant Luis Carlos Martella on 'Long Toenail' was killed. Second Lieutenant Perez-Grandi was also down. His conscripts carried him away, severely wounded. Perez-Grandi had spent a year in the 4th Airborne Artillery Group as a conscript before entering the Buenos Aires Army Academy.

Naturally the Army needed a scapegoat and Major Ricardo Cordon was court-martialed and sacked. Bad luck played at least a malignant part as the loss of his reserve platoon and communications in the 4th Regiment's 'C' Company.

Naturally the Army needed a scapegoat and Major Ricardo Cordon was court-martialed and sacked. Bad luck played at least a malignant part as the loss of his reserve platoon and communications in the 4th Regiment's 'C' Company.

Sergeant-Major George Meachin of ''Yankee'' Company, later praised the fighting spirit of the Argentinian defenders:{{cquote|We came under lots of effective fire from 0.50 calibre machine guns …At the same time, mortars were coming down all over us, but the main threat was from those machine-gunners who could see us in the open because of the moonlight. There were three machine-guns and we brought down constant and effective salvoes of our own artillery fire on to them directly, 15 rounds at a time. There would be a pause, and they’d come back at us again. So we had to do it a second time, all over their positions. There’d be a pause, then ‘boom, boom, boom,’ they’d come back at us again. Conscripts don’t do this, babies don’t do this, men who are badly led and of low morale don’t do this. They were good steadfast troops. I rate them.<ref>The FN FAL Battle Rifle, Bob Cashner, Page 57, Bloomsbury Publishing 2013</ref>}}

Sergeant-Major George Meachin of ''Yankee'' Company, later praised the fighting spirit of the Argentinian defenders:{{cquote|We came under lots of effective fire from 0.50 calibre machine guns …At the same time, mortars were coming down all over us, but the main threat was from those machine-gunners who could see us in the open because of the moonlight. There were three machine-guns and we brought down constant and effective salvoes of our own artillery fire on to them directly, 15 rounds at a time. There would be a pause, and they’d come back at us again. So we had to do it a second time, all over their positions. There’d be a pause, then ‘boom, boom, boom,’ they’d come back at us again. Conscripts don’t do this, babies don’t do this, men who are badly led and of low morale don’t do this. They were good steadfast troops. I rate them.<ref>The FN FAL Battle Rifle, Bob Cashner, Page 57, Bloomsbury Publishing 2013</ref>}}