 On 26 October 1975, a Catholic youth leader, Juan Ignacio Isla Casares, with the help of the Montoneros commander Eduardo Pereira Rossi (nom de guerre "El Carlón") was the mastermind behind the ambush and killing of five policemen (Pedro Dettle, Juan Ramón Costa, Carlos Livio Cejas, Cleofás Galeano and Juan Fernández) near San Isidro Cathedral.During February 1976, the Montoneros sent assistance to the hard-pressed "Compañía de Monte Ramón Rosa Jiménez" fighting in Tucumán province, in the form of a company of their elite "Jungle Troops", while the ERP backed them up with a company of their guerrillas from Cordoba.The "Baltimore Sun" reported at the time, ""In the jungle-covered mountains of Tucuman, long known as "Argentina's garden," Argentines are fighting Argentines in a Vietnam-style civil war.