How did fidel castro became involved in revolutionary activities?

Son of a wealthy farmer, Castro adopted left-wing anti-imperialist policy while studying law at the University of Havana. After participating in rebellions against right-wing governments in the Dominican Republic and Colombia, he planned the overthrow of Cuban President Fulgencio Batista, launching a failed attack on the Moncada Barracks in 1953. After a year in prison, he traveled to Mexico where he formed a revolutionary group, the 26th of July Movement, with his brother Raúl Castro and Che Guevara. Returning to Cuba, Castro assumed a fundamental role in the Cuban Revolution, leading the movement in a guerrilla against the forces of Batista in the Sierra Maestra. After Batista's defeat in 1959, Castro assumed military and political power as Cuba's prime minister.

where is the map at?

which specific shipwreck are you talking about?