On 8 June reinforcements in the form of machine-gunners, mortarmen and protecting riflemen from the 1st 'Patricios' Infantry Regiment, Regiment of Mounted Grenadiersand 17th Airborne Infantry Regimentarrived from Comodoro Rivadavia to support the 4th Infantry Regiment. On the night of 8–9 June, action on the outer defence zone flared when Lieutenant Mark Townsend's 1 Troop (K Company, 42 CDO) probed Mount Harriet, killing two Argentines (Corporal Hipolito Gonzalez and Private Martiniano Gomez) from Second Lieutenant Jiménez Corbalán's 3rd Platoon. At the same time, two platoon-sized fighting patrols from 45 Commando attempted the same on Two Sisters Mountain, but the Argentine RASIT ground surveillance radar on Mount Longdon was able to detect the 45 Commando platoons, and artillery fire dispersed the British force. In all, Second Lieutenant Lautaro Jiménez Corbalán would report the loss of 6 killed and 14 wounded fighting off Lieutenant Marwood's Recce Troop on Mount Wall and the raid of Lieutenant Towsend's 1 Troop, including losses suffered during the final British assault on Mount Harriet on the night of 11-12 June.