1st Infantry Division on 11th November 1918 held the line along Meuse river, near the town Mouzon (that were the final stages of Meuse-Argonne offensive, and whole war altogether); in the movie, when sergeant and his team approach an ambush by the old cross, we see that this is the spot from the first scene, the last day of the WWI. And on the memorial ("But the names are the same...") it reads "Killed in action - Soissons". Big Red One actually did fight near Soissons, but that was during the so-called Second Battle of the Marne, July to first week of August 1918.