Guevara met Fidel Castro and Fidel's brother Raúl in Mexico City where the two sought refuge after being exiled from Cuba. The Castro brothers were preparing to return to Cuba with an expeditionary force in an attempt to overthrow General Fulgencio Batista, who had assumed dictatorial powers following a coup d'état during the 1952 presidential elections. Guevara quickly joined what became known as the "26th of July Movement".
Castro, Guevara, and 80 other guerrillas departed from Tuxpan, Veracruz, aboard the cabin cruiser Granma in November 1956. (The name was most likely a tribute to the grandmother of the previous owner, an American.) Guevara was the only non-Cuban aboard.
Shortly after disembarking in a swampy area near Niquero in the southeast, the expeditionary unit was attacked by Batista's forces. Only 12 rebels survived. Guevara, the group's physician, laid down his knapsack containing medical supplies in order to pick up a box of ammunition dropped by a fleeing comrade, a moment which he later recalled as marking his transition from doctor to combatant. [1] (http://www.patriagrande.net/cuba/ern...lucionaria.htm)
The rebels slowly gained in strength, seizing weapons and winning support and recruits from the local peasants in rural areas and intellectuals and workers in urban areas. Guevara exhibited great courage, skill in combat, and ruthlessness and soon became one of Castro's ablest and most trusted aides. Guevara took responsibility for the execution of informers, insubordinates, deserters and spies in the revolutionary army. He personally executed Eutimio Guerra, a suspected Batista informant, with a single shot from his .32 (7.65 mm) pistol.
Within months, Guevara rose to the highest rank, Comandante (Major), in the revolutionary army. His march on Santa Clara in late 1958, where his column derailed an armored train filled with Batista's troops and took over the city, was the final straw that forced Batista to flee the country. Guevara recorded the two years spent in overthrowing Batista's regime in a detailed account entitled Pasajes de la Guerra Revolucionaria (English translation, Reminiscences of the Cuban Revolutionary War, 1968), first published in 1963.
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