American amputee and nurse, Walter Reed Army Hospital, U.S. Government, public domain |
If you stick with the movie to its conclusion, you will see not only action by artillery and in trenches, but evacuation teams of stretcher bearers, as well as caissons drawn by horses and invasion into a small town, presumably Chateau Thierry.
Go here:
http://youtu.be/PusFK9U51LY