Based on the Kenneth Roberts novel of the same name, this film tells the story of two friends who join Rogers' Rangers, as the legendary elite force engages the enemy during the French and Indian War. The film focuses on their famous raid at Fort St. Francis and their marches before and after the battle.

Major Vickers is an officer at the 27th Lancers in India 1856. When the regiment is on maneuver, the barracks are attacked by Surat Khan and his soldiers who massacre British women and children. This leaves an inextinguishable memory and Vickers promises to revenge the dead.

After a cavalry group is massacred by the Cheyenne, only two survivors remain: Honus, a naive private devoted to his duty, and Cresta, a young woman who had lived with the Cheyenne two years and whose sympathies lie more with them than with the US government. Together, they must try to reach the cavalry's main base camp. As they travel onward, Honus is torn between his growing affection for Cresta, and his disgust for her anti-American beliefs. They reach the cavalry campsite on the eve of an attack on a Cheyenne village, where Honus will learn which side has really been telling him the truth.

In Revolutionary America, Gil Martin takes his new wife Lana back to his farm in upstate New York. The area is remote and a distance from the fort but they are happy living in their one room cabin. With the declaration independence, the settlers soon find themselves at war with the British and their Indian allies. Their farm is burned out and the Martins take work with Sarah McKlennar. The war continues however as the Martins try to make a new life.