Cheinisse, Claude. "Le suicide"
Divergence: 1914 CE
What if: World War I didn't start until 1920, by which time the participants had weapons of greater destructive capability.
Summary: A scientist named Prinzip builds a time machine and goes back to 1914 Sarajevo.
Published: In Les mondes francs, Livre de poche (1988).
Original in: French.