 Three days after his arrival in Bolivia , Guevara left La Paz for the rural south east region of the country to form his guerrilla army . Guevara 's first base camp was located in the montane dry forest in the remote Ñancahuazú region . Training at the camp in the Ñancahuazú valley proved to be hazardous , and little was accomplished in way of building a guerrilla army . The Argentine @-@ born East German operative Haydée Tamara Bunke Bider , better known by her nom de guerre " Tania " , had been installed as Che 's primary agent in La Paz . 
