Bosko the Doughboy (1931) - Public Domain Cartoons

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Summary
The cartoon opens with images of explosions, gunfire, and heavy artillery; one character even fires into the camera. It is World War I, and the ever-cheerful Bosko is a doughboy eating down in a trench. Enemy fire destroys his meal, and later a picture of his girlfriend, Honey. Bosko shows a rare moment of anger, but is quickly cheered up by a fellow soldier. The two begin to dance, only to be interrupted by more gunfire. Bosko finally decides to fight back and downs an enemy bomber (actually a pelican) by using a fellow soldier as a cannon. A friendly hippopotamus is shot down by heavy artillery, which Bosko destroys with a pair of longjohns-turned-catapult. He then saves the wounded soldier by unzipping his navel and retrieving the shell inside. The projectile explodes anyway, turning the already black-faced Bosko even blacker and prompting him to exclaim "Mammy!"