The Battle of Gravelotte — in which French forces under François Achille Bazaine were defeated in an encounter outside the city of Metz — took place during which war?

The Battle of Gravelotte — in which French forces under François Achille Bazaine were defeated in an encounter outside the city of Metz — took place during which war?

Hundred Years’ War
Napoleonic Wars
Franco-Prussian War
World War I
World War II

The Answer: The correct answer is Franco-Prussian War.