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

As a young soldier in the Belgian Army, Indy learns firsthand the savagery of warfare while participating in the Battle of the Somme. Almost succumbing to despair as his life becomes an endless round of artillery barrages, nerve gas attacks and decaying corpses, Indy fears that death will be his only way out. Then he is captured by the Germans and confined to a POW camp where he and fellow prisoner Charles de Gaulle hatch a daring scheme to win their freedom in true "Great Escape" style.