In January 1974 the ERP '' Compañía Héroes de Trelew '' , named in commemoration of the 1972 Massacre of Trelew , during which 16 left-wing guerrillas who had attempted to escape detention had been shot dead , attacked the barracks at Azul , killing the Commanding Officer ( Colonel Camilo Arturo Gay ) and his wife ( Hilda Irma Casaux ) and kidnapping and later executing Lieutenant-Colonel Jorge Ibarzábal , with Patricia Gay the daughter of Gay and Casaux later taking her own life . However , in August , an assault on the Argentine Army 's Villa Maria explosives factory in Cordoba and the 17th Airborne Infantry Regiment at Catamarca by 70 ERP guerrillas dressed in army fatigues , met mixed fortune after killing and wounding eight policemen and soldiers but losing 16 guerrillas shot dead after they surrendered to 300 paratroopers of the 17th Airborne Infantry Regiment under Lieutenant-Colonel Eduardo Humberto Cubas . On 23 October 1974 , ERP guerrillas shot and killed Lieutenant-Colonel José Francisco Gardón as he was leaving the Buenos Aires hospital where he specialized in blood diseases . On 18 August 1975 Captain Miguel Alberto Keller , accompanied by an NCO and five conscripts were forced to stop their army lorry at what they believed to be a military checkpoint , and Keller was shot dead as he approached the ERP guerrillas waiting in ambush . In December 1975 a force of some 300 ERP guerrillas and supporting militants attacked the Monte Chingolo barracks outside Buenos Aires but lost 63 dead , many of whom were wounded in the attack and subsequently killed . In addition , seven army troops and three policemen were killed and 34 wounded ( including 17 policemen ) . In all , 293 Argentine servicemen and police were killed fighting left-wing guerrillas between 1975 and 1976 . In 1976 there had been plans to send a large part of the Uruguayan '' Tupamaros '' ( MLN-T ) , the Chilean '' Movimiento de Izquierda Revolucionaria '' ( MIR ) and the Bolivian '' National Liberation Army '' ( ELN ) to fight alongside the ERP and Montoneros in Argentina , but the plans failed to materialize largely due to the military coup
Massacre of Trelew
Trelew massacre
People's Revolutionary Army (Argentina)