Question: What was the name of the guerilla force that eventually challenged the rule of the Cuban dictator who was U.S.-backed from 1952 to 1959?
Sentence (from "Camilo Cienfuegos"): Camilo Cienfuegos Gorriarán (] ; 6 February 1932 – 28 October 1959) was a Cuban revolutionary born in Havana.
Relevant evidence: No