Castro's troops at Playa de Citron after successfully repelling the US-backed invasion of the Bay of Pigs. (Photo by Graf/Getty Images). April, 1961

A group of captured Cubans are lined up by Castro's soldiers on the Playa de Giron, Cuba, mid-late April, 1961. They are of the US-backed force of Cuban exiles (known as Brigade 2506) who attempted invasion at the Bay of Pigs. (Photo by Three Lions/Getty Images)

Some of the 1,179 US backed mercenaries and cuban exiles before a revolutionary court in Havana. They are being tried for their part in the invasion of Cuba at Playa Giron (Bay of Pigs). (Photo by Keystone/Getty Images). April, 1961

Cuban militiamen and members of the Revolutionary Army celebrating their victory over US mercenaries at Playa Giron, in what became known as the Bay of Pigs Invasion. They are gathered in a launch belonging to the captured mercenaries. (Photo by Keystone/Getty Images). April, 1961

Castro's soldiers at Playa de Giron, Cuba, after thwarting the ill-fated US backed 'Bay of Pigs' invasion. (Photo by Graf/Getty Images). April, 1961

The bodies of some of those who participated in the ill-fated Bay of Pigs invasion of Cuba. (Photo by Graf/Three Lions/Getty Images). 1961

Members of the Indian Communist Party marching to the American embassy to protest at US intervention in Cuba, during the Bay of Pigs invasionn. The demonstrators later stoned the embassy building. (Photo by Central Press/Getty Images). 21st April 1961

Castro's soldiers looking at a blood-stained shirt after the ill-fated “Bay of Pigs” invasion at Playa de Giron, Cuba. (Photo by Three Lions/Getty Images). 1961

Artillery shells scattered on the beach at the holiday resort of Playa de Giron, Cuba, after the ill-fated 'Bay of Pigs' invasion. (Photo by Graf/Three Lions/Getty Images). April 1961

Members of Castro's militia in the Escambry Mountain area of Cuba during the ill-fated US backed Bay of Pigs invasion. (Photo by Three Lions/Getty Images). 1961