Sykes and cross the Rio Grande to the rural village where Angel was born. The village elder warns them about General Mapache, a vicious Huertista officer in the Mexican Federal Army, who has been stealing food and animals from local villages to support his campaign against the forces of Pancho Villa. Pike's gang ask the general for work at his headquarters in the town of Agua Verde. Angel spots his former lover Teresa in Mapache's arms and shoots her dead, angering the general and nearly getting them killed, but Pike defuses the situation. Mapache offers gold to the gang to rob a U.S. Army train so Mapache can resupply his army's dwindling stocks of ammunition and provide samples of American weapons to his German military adviser Commander Mohr. Angel gives his share of the gold to Pike in return for sending one crate of rifles and ammunition to a band of peasant rebels opposed to Mapache. The holdup goes largely as planned until Thornton's posse turns up on the train the gang has robbed and chases them to the Mexican border. The robbers blow up a trestle bridge spanning the Rio Grande as the posse tries to cross, dumping the entire posse into the river, but the exhausted posse continues their pursuit. Pike, anticipating that Mapache might double-cross him, hides the goods and has his men sell them to Mapache in separate amounts. However, Mapache learns from Teresa's mother that Angel stole some of the weapons and reveals this as Angel and Dutch deliver the last of the weapons. Angel desperately tries to escape, only to be captured, beaten, and dragged through town on a rope tied to the back of Mapache's car. Mapache lets Dutch go after he states that Angel is a thief who deserves to be punished, and Dutch then tells Pike and the others what happened. Sykes is wounded by Thornton's posse while securing spare horses. Dutch criticizes Thornton for working with the railroad, but Pike says Thornton "gave his word" to the railroad and must see it through. Dutch angrily declares, "That ain't what counts, it's who you give it to." Pike and the gang bury most of the gold and return to Agua Verde, where the townspeople and soldiers are drunkenly celebrating the weapons sale. Mapache refuses to sell Angel back to the gang, and after a period of reflection while visiting a brothel,