led by Colonel Günther Reza. John and Juan volunteer to stay behind with two machine guns and dynamite. Much of the Mexican army's detachment is destroyed while crossing a bridge, which is blown up by John. Colonel Reza, who commands an armored car, survives. After the battle, John and Juan find most of their comrades, including Juan's father and children, have been killed by the army in a cave which served as the rebels' hideout. Grief-stricken and enraged, Juan goes out to fight the army single-handed and is captured. John sneaks into camp, where he witnesses executions of many of his fellow revolutionaries by firing squad. They had been informed on by Dr. Villega, who has been tortured by Colonel Reza and his men. This evokes in John memories of a similar betrayal by Nolan, his best friend in Ireland. After Nolan identified John, John killed two British soldiers and then killed Nolan, making him a fugitive and forcing him to flee Ireland. Juan faces a firing squad of his own, but John arrives and blows up the wall with dynamite just in time. They escape on John's motorcycle. John and Juan hide in the animal coach of a train. It stops to pick up the tyrannical Governor Don Jaime, who is fleeing (with a small fortune) from the revolutionary forces belonging to Pancho Villa and Emiliano Zapata. As the train is ambushed, John, as a test of Juan's loyalty, lets him choose between shooting the Governor and accepting a bribe from him. Juan kills Jaime, also stealing the Governor's spoils. As the doors to the coach open, Juan is greeted by a large crowd and once again is unexpectedly hailed as a great hero of the revolution. The money is taken away by revolutionary General Santerna. On a train with commanders of the revolution, John and Juan are joined by Dr. Villega, who has escaped. John alone knows of Villega's betrayal. They learn that Pancho Villa's forces will be delayed by 24 hours and that an army train carrying 1,000 soldiers and heavy weapons, led by Colonel Reza, will be arriving in a few hours that evening, which will surely overpower the rebel position. John suggests they rig a locomotive with dynamite and send it head on. He requires one other man, but instead of picking Juan, who volunteers, he chooses Dr. Villega. It becomes clear to Villega that