Led by Lt.Col. Nick Vaux the attack was preceded by a week of night fighting patrols which were themselves aimed at misdirecting the enemy away from 42's true intentions. Over the course of 5 nights numerous recce patrols cleared a 9 km route through an Argentinian minefield. A night attack launched from the enemy's rear, the battle for Mt Harriet is regarded as a lesson in planning, shock and surprise. From Army Doctrine Publications: Land Operations AC 71819: Mount Harriet (1982) 42 Commando Royal Marines assaulted Mount Harriet in the Falklands on the night of 11-12 June 1982 in a surprise attack from the enemys rear. The 4th Argentine Infantry Regiment defending Harriet expected an attack from Mount Wall to the west; a diversionary attack by 12 Troop of 42 Commando reinforced that perception. The main body attacked from the south-east and approached to within about a hundred metres of the Argentine positions before it was detected. The assault was very rapid: leading elements reached the crest of Mount Harriet within about 40 minutes; the crestline was cleared within about two hours; and the fighting largely complete within 5 hours. The Argentine regimental command post and mortar platoon were overrun early in the assault: a lucky consequence of the chosen axis of attack, but the effects of this selective destruction were significant. The Argentines lost much of their primary indirect fire support and command and control of their forces; both affected their cohesion. An Argentine company commander attempted to organize a counterattack force on the north side of the ridgeline; however a sudden, concentrated artillery fire mission broke up the attack. The survivors were seen fleeing east towards Stanley through the smoke and darkness. The surprise attack, shock action and some aspects of the destruction achieved had overcome the 4th Argentine Infantry Regiments cohesion; it collapsed and was effectively destroyed as a fighting force The battle contrasts with the other five battalion battles in the Falklands Conflict - Goose Green, Mount Longdon, Wireless Ridge, Two Sisters and Tumbledown - which all took over 7 hours fighting. 42 Commando suffered only 2 dead and 7 wounded; substantially less than Goose Green, Longdon and Tumbledown, and slightly less than Two Sisters and Wireless Ridge. 42 Commando captured over 300 prisoners, more than any other unit involved (except for 2nd Battalion, the Parachute Regiment, who captured 1007 Argentinians when the garrison of Darwin surrendered after Goose Green). Proud to have been there.