The Cavalry is frustrated when gun smugglers escape across the Rio Grande River, which they have orders not to cross. They trick the smugglers into stealing defective rifles and when the Mexicans chase them back across the border for selling them bad goods, the smugglers are caught in a crossfire from both the Mexicans and the Calvary.; When Chief Otter Claw's son develops smallpox, his medicine man says it is the white man's fault and wants to wage war. Capt. Adams brings the fort doctor to apply a vaccination to the boy and his recovery is the key to war or peace.; A new Sergeant at the fort does everything "by the book" of Army Regulations. His rigid adherence to the regulations causes friction in the fort and when he goes out on patrol, their horses are stolen by Apaches and he and his men have to walk.; Facts about life inside a western Army fort.; Facts about the types of men who joined the Army after the Civil War.