Colonel Appeltown must be absent. He delegates the command of Fort Bow to Captain Joyce, an ambitious and tyrannical man. Although he is determined to make an iron discipline reign, four soldiers come to desert. Joyce, mad with rage, decides to catch them. Flanked with Chesterfiel and Blutch, they go after them and cross the road of the Comanches who capture Captain Joyce. Our two companions will have to appeal to the deserters to remove the captain from the hands of the Indians. But it is finally the cavalry of the fort that will get them out of this petrin.