"For liberals in the West, the showdown between the Spanish Republic and Franco's nationalist rebels seemed the first real chance to stop Fascism's terrifying advance. Volunteers from fifty-four countries, including three thousand from the United States, formed international brigades to assist in the cause. The Largo Caballero government, still desperate for help, turned to Stalin, who offered men and equipment in return for a clandestine shipment of the country's entire supply of gold. Celebrity photographers, poets, and writers- Ernest Hemingway included- hurried to chronicle and at times glamorize the competition between the forces of light, as they saw it, and darkness. The conflict, though, was anything but romantic. It lasted four years and killed more than half a million people. There were long lulls, but the clashes were savage. Each side executed prisoners, and each cast a wide net in arresting enemy sympathizers. For Franco, the systematic rooting out of potential foes was just good strategy. One of his subordinates told allied mayors, "It is necessary to create an atmosphere of terror. We must create an impression of mastery. Anyone who is overtly or secretly a supporter of the Popular Front must be shot.""