This article describes the course of the guerrilla focus set up by Che Guevara in 1967 in the mountain ranges of Bolivia. The report deals with the branching of the "Ejército de Liberación Nacional" (ELN), and its connections with Cuba, Chile and other Latin American countries. The author renders special attention to the Chilean followers of the ELN, and to the ideological conceptions that took them to join the guerrilla, as well as on their underground lives and their participation in the subsequent combats of Teoponte.