The legendary true story of a small band of soldiers who sacrificed their lives in hopeless combat against a massive army in order to prevent a tyrant from smashing the new Republic of Texas.

When half-breed Indian Yaqui Joe robs an Arizona bank, he is pursued by dogged lawman Lyedecker. Fleeing to Mexico, Joe is imprisoned by General Verdugo, who is waging a war against the Yaqui Indians. When Lyedecker attempts to intervene, he is thrown into prison as well. Working together, the two escape and take refuge in the hills, where Lyedecker meets beautiful Yaqui freedom fighter Sarita and begins to question his allegiances.

After arriving in Texas to escape a scandal back east, lawyer Sam Houston just wants to hang out his shingle, keep a low profile, and stay out of any political intrigue. However, when President Jackson personally orders him to lead the fight for Texan independence, he overcomes his reluctance to become involved and leads his compatriots to a string of victories over the Mexican army.

The story of the defense of the mission-turned-fortress by 185 Texans against an overwhelming Mexican army in 1836.