The 5th Marine Battalion's M Company (under Marine Captain Rodolfo Cionchi) and supporting Tigercat SAM launchers and Hispano Suiza 30 mm guns from the 1st Marine Anti-Aircraft Battalion were stationed along the Sapper Hill slopes, with part of the Puerto Belgrano-based Marine Dog Platoon (under Sub-Lieutenant Miguel Paz) providing extra security in the form of 5 canines ("Ñaro", "Nego", "Vogel", "Warner" and "Xuavia") and their handlers and accompanying riflemen.