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 "Eloy Gutiérrez Menoyo"): Eloy Gutiérrez Menoyo (December 8, 1934; Madrid, Spain—October 26, 2012; Havana, Cuba) led the guerilla force "Second National Front of the Escambray Mountains" during the Cuban Revolution against Fulgencio Batista and later opposed the government of Fidel Castro over its pro-Soviet leanings.
Relevant evidence: Yes