Kammala wannan jumla: Bayan barin Cuba, Dalton ya shiga cikin
Yaƙin basasa na El Salvador, ya shiga cikin Sojojin Juyin Juya Halin Jama'a (ERP) a 1973. A cikin ERP, ya sami kansa cikin rikici na ciki mai tsanani tare da jagora Alejandro Rivas Mira, wanda ke zama jagora mai tasiri na ƙungiyar masu dauke da makamai. A sakamakon haka, shugabancin ERP ya yanke shawarar kashe shi.