So Quiet on the Canine Front (1931)

During anatomy class, students learn that war has broken out. Several enlist and are sent to Camp Poodle, for rookie training. At first the constant shelling bothers them, but within a week they are veterans, unfazed. Barker sort of volunteers to parachute behind enemy lines disguised as a nurse to get the enemy's troop movements. He's captured and sentenced to die, so his mates in the Airdale Army attempt a rescue. Will they succeed?