Christmas comes to Heartland, along with an anonymous call about starving horses stranded by an avalanche in the Rocky Mountains, which send Amy and Ty to their rescue.

In 1932, a modernizing U.S. Army orders the Cavalry to destroy its horses but some sympathetic cavalrymen, defying orders, steal the horses in order to save them from destruction, to the dismay of the top Army-brass.

When an expert horseman (Luke Perry) suffers a traumatic accident with his top horse, he overcomes his injury with the help of a young girl who helps rehabilitate him and the horse