When half-breed Indian Yaqui Joe (Burt Reynolds) robs an Arizona bank, he is pursued by dogged lawman Lyedecker (Jim Brown). When Lyedecker meets beautiful Yaqui freedom fighter Sarita (Raquel Welch) he begins to question his allegiances.

There’s a deficit of good, honest women in the West, and Roy Whitman wants to change that. His solution is to bring a caravan of over 100 mail-order brides from Chicago to California. It will be a long, difficult and dangerous journey for the women. So Whitman hires hardened, cynical Buck Wyatt to be their guide across the inhospitable frontier. But as disaster strikes on the trail, Buck just might discover that these women are stronger than he thinks.