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On June 10, Lieutenant Colonel Hew Pike gave his orders in the Regimental Headquarters at Estancia House for the attack on Mount Longdon and Wireless Ridge. They were told to expect around 300 Argentinian soldiers from Lieutenant-Colonel Omar Giménez's 7th 'La Plata' Mechanized Infantry Regiment defending the positions who were well dug in and provided with artillery cover from 18 Argentine 105mm Oto Melara howitzers from Lieutenant-Colonel Martín Antonio Balza's 3rd Artillery Group and a further 18 Oto Melaras near Government House from Lieutenant-Colonel Carlos Alberto Quevedo's 4th Airborne Artillery Group. In addition, the area had been heavily mined. British sappers later counted 1,500 frozen anti-personnel mines on the western lower slopes of Mount Longdon. Miraculously all but two mines failed to detonate.<ref>[https://www.sunderlandecho.com/news/feature-sunderland-falklands-veterans-remember-the-battle-of-mount-longdon-1-4623600 Sunderland Falklands veterans remember the Battle of Mount Longdon]</ref>  

On June 10, Lieutenant Colonel Hew Pike gave his orders in the Regimental Headquarters at Estancia House for the attack on Mount Longdon and Wireless Ridge. They were told to expect around 300 Argentinian soldiers from Lieutenant-Colonel Omar Giménez's 7th 'La Plata' Mechanized Infantry Regiment defending the positions who were well dug in and provided with artillery cover from 18 Argentine 105mm Oto Melara howitzers from Lieutenant-Colonel Martín Antonio Balza's 3rd Artillery Group and a further 18 Oto Melaras near Government House from Lieutenant-Colonel Carlos Alberto Quevedo's 4th Airborne Artillery Group. In addition, the area had been heavily mined. British sappers later counted 1,500 frozen anti-personnel mines on the western lower slopes of Mount Longdon. Miraculously all but two mines failed to detonate.<ref>[https://www.sunderlandecho.com/news/feature-sunderland-falklands-veterans-remember-the-battle-of-mount-longdon-1-4623600 Sunderland Falklands veterans remember the Battle of Mount Longdon]</ref>  

Mount Longdon is a long narrow feature of rocky terrain, running from east to west with two summits. 34-year-old Major Carlos Carrizo-Salvadores, second-in-command of the 7th Regiment, was the senior officer on the eastern summit ('Full Back'), and Marine Captain Sergio Andrés Dachary on the western one ('Fly Half'). There was a Rasit radar set on Longdon, with which the defenders could scan the Murrell River area at night to reveal any hostile troop movements. As a result of its geography only one company attacking could advance along it. The plan was that the rifle companies would be led to the start line at the river, west of Mount Longdon by members of Captain Matthew Selfridge's D (Patrol) Company. The start line would be known as ‘Free Kick’.

The 7th Regiment under Lieutenant-Colonel Omar Giménez, had been sent to dig in on Mount Longdon and Wireless Ridge. More specifically, the regiment was supposed to counter a British force coming from Berkeley Sound. The garrison on Mount Longdon was made up of the 7th Regiment's 'B' Company. 34-year-old Major Carlos Carrizo-Salvadores had been selected to command all the Argentinian forces on Mount Longdon. He seemed an excellent choice when taking into account his aggressive nature as a parachute officer.

At 2015 local time on Friday June 11th 1982, the 3rd Battalion (3 PARA) from the British Parachute Regiment, commanded by Lieutenant-Colonel Hew Pike began to advance to Mount Longdon. At the same time, 42 Commando Battalion was advancing towards Mount Harriet, whilst 45 Commando Battalion was heading for Two Sisters Mountain. The objective of the night attack of June 11 were three rocky peaks in the area west of Port Stanley: Mount Longdon, Two Sisters Mountain and Mount Harriet.

At 2015 local time on Friday June 11th 1982, the 3rd Battalion (3 PARA) from the British Parachute Regiment, commanded by Lieutenant-Colonel Hew Pike began to advance to Mount Longdon. At the same time, 42 Commando Battalion was advancing towards Mount Harriet, whilst 45 Commando Battalion was heading for Two Sisters Mountain. The objective of the night attack of June 11 were three rocky peaks in the area west of Port Stanley: Mount Longdon, Two Sisters Mountain and Mount Harriet.