From Wikipedia

 Line of Fire - Port Stanley

 On the night of 11 June, after several days of painstaking reconnaissance and logistic build-up, British forces launched a brigade-sized night attack against the heavily defended ring of high ground surrounding Stanley. After 3 Para took Port Stanley, units of 3 Commando Brigade, supported by naval gunfire from several Royal Navy ships, simultaneously assaulted in the Battle of Mount Harriet, Battle of Two Sisters, and Battle of Mount Longdon. Mount Harriet was taken at a cost of 2 British and 18 Argentine soldiers. At Two Sisters, the British faced both enemy resistance and friendly fire, but managed to capture their objectives. The toughest battle was at Mount Longdon. British forces were bogged down by assault rifle, mortar, machine gun, artillery fire, sniper fire, and ambushes. Despite this, the British continued their advance.