The Sioux accuse the wagon train of having a member who is smuggling arms and ammunition to their enemies, the Cheyenne. The Major and McCullough suspect a new man who just joined the train, but a search of his wagon doesn't turn up anything.; The wagon train is delayed because they must build a bridge across a river. Major Adams sends a teen boy to buy supplies at Sierra City, a town ten hours away. When he gets there he is robbed of the money he was given to buy supplies. Later the Major comes to the town to see what the delay is.; Major Adams arranges a fist fight between Flint and a warrior for safe passage through Indian lands.; How early explorers in the old West left markers for others to follow.