Book III Print 6: United States hostagesYale University. Department of Manuscripts and Archives1958 JulyengspaThis print shows United States hostages held by Raúl Castro's forces in the liberated zone created by his recently opened Second Front "Frank País," preparing to be released. The hostages were taken as part of a defensive strategy developed in June 1958 when evidence emerged that the United States was continuing to ship military supplies (such as napalm) to Batista's air force through Guantánamo Bay Naval Base, despite the fact that the United States had declared an official embargo on further arms shipments in March of that year. In May, Batista's air force flew over one hundred flights that bombed and attacked the civilian population in the mountains that offered aid to the rebels. The hostage (shown shaving in frames 5-7) appears to be one of the United States company employees taken hostage, rather than a marine. The twenty-eight marines captured were being held elsewhere. See also Prints 1-5, 7, and 8.