A cavalry outpost in the Western frontier faces challenges under the command of the rigid and by-the-book Lieutenant Colonel Thursday. Upon his arrival, Thursday's strict leadership style clashes with the seasoned Captain York, who understands the complexities of dealing with the local Apache tribes. The outpost is staffed with a colorful mix of soldiers and civilians, including Thursday's daughter, who becomes romantically involved with a young lieutenant. The tension between the officers deepens as Thursday's disdain for the Apaches and his arrogance in military strategy lead to ever more dire consequences.

As conflicts with the Apache escalate, the story delves into the varied motivations and perspectives of the fort's inhabitants. Thursday's obsession with military glory blinds him to the more human approach advised by York, resulting in a series of tactical blunders. The soldiers find themselves caught between duty and the moral imperative to recognize the humanity of their adversaries. The narrative builds towards a critical confrontation, testing the personal and professional resolve of everyone involved.