Rin Tin Tin is ready and reporting for duty! Corporal Lee Duncan finds a comrade in arms in a German shepherd puppy. Determined to keep his furry friend in his platoon, Duncan decides to put the expertise of a POW dog handler to use and trains Rin Tin Tin to assist the troops. With patience and kindness, the puppy grows into a first-class soldier and hero to soldiers on the battlefield. After the Great War is over, Rin Tin Tin returns home with Duncan and goes on to star in 14 feature films from 1920 - 1931 and was considered to be one of Hollywood's top movie stars.on four legs.