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Naval mutiny at Cienfuegos

On 6 September 1957 elements of the Cuban navy in the Cienfuegos Naval Base staged a rising against the Batista regime. Led by junior officers in sympathy with the 26th of July Movement, this was originally intended to coincide with the seizure of warships in Havana harbour. Reportedly individual officials within the U.S. Embassy were aware of the plot and had promised U.S. recognition if it were successful.

By 5:30am the base was in the hands of the mutineers. Most of the 150 naval personnel sleeping at the base joined with the twenty-eight original conspirators, while eighteen officers were arrested. About two hundred 26th of July Movement members and other rebel supporters entered the base from the town and were given weapons. Cienfuegos was in rebel hands for several hours. By the afternoon Government motorised infantry had arrived from Santa Clara, supported by B-26 bombers. Armoured units followed from Havana. After street fighting throughout the afternoon and night the last of the rebels, holding out in the police headquarters, were overwhelmed. Approximately 70 mutineers and rebel supporters were executed and reprisals against civilians added to the estimated total death toll of 300 men.

The use of bombers and tanks recently provided under a US-Cuban arms agreement specifically for use in hemisphere defence, now raised tensions between the two governments.