The Adventures of Young Indiana Jones: Trenches of Hell (1999)

August, 1916. Using the name 'Henri Defense', 17 year old Indiana Jones has enlisted in the Belgian army to fight in the Great War. After all his commanding officers have been wiped out during combat in Flanders, Corporal 'Defense' is left in charge of what's left of the 9th Belgian Infantry. They are assigned to the French 14th Company and dispatched into the Battle of the Somme. When Indy is captured by the Germans, he quickly gains a reputation as an escape artist, and is sent to the maximum security prison at Dunsterstadt on the Danube.