 In 1937 he was appointed secretary of security and joined the Communist Party of Spain.He was also, among other things, responsible for the arrest of Andreu Nin and because of this, was dismissed by the minister of the interior, Julian Zugazagoitia; eventually being transferred to field command.On March 1939, he was the commander in charge of the III Army Corps of the Army of the Centre and supported Luis Barceló against the National Defence Council "(Consejo Nacional de Defensa)" during what later became the "Final offensive of the Spanish Civil War".