Here's a great World War I set animated short called The Jockstrap Raiders. The story follows "a group of misfits during world war I. It takes place in Leeds, England where our heroes are all excluded from the war due to various abnormalities. Threatened by the invading German Kaiser and his army, they must learn to become a team and overcome their deficiencies in order to save Britain, and the world."
The short was made at UCLA by Mark Nelson as his MFA thesis project. It has won several awards that include the Student Academy Award; Best Animation, British Animation Festival; Best Animation, Macon Film Festival; Best Narrative Short GI Film Festival, and the Orlando Film Festival; Audience Award.
I thought the short was really fun and entertaining. I think you'll enjoy it so check it out!