Three United States Army National Guard soldiers (MSgt. William Connors, Pvt. Michael McCluskey, Cpl. Richard Langsford) are an M5 Stuart tank crew participating in a war game being conducted near the Battle of Little Bighorn, the site of Lieutenant Colonel George Custer's last stand. Their orders coincide with the route of Custer and his men. As they follow the route, they hear strange things such as Indian battle cries and horses running. As nobody is there, the men examine the possibilities. Connors wonders if they've somehow gone back in time. When they return, Connors reports to his captain what occurred and is reprimanded. The following day the trio goes out and again begins to experience strange phenomena. The captain contacts them via radio and orders them to return to base when Co