France’s victory over the Germans at the Battle of Gravelotte — one of the bloodiest engagements of the Franco-Prussian War — occurred on August 18th of what year?

France’s victory over the Germans at the Battle of Gravelotte — one of the bloodiest engagements of the Franco-Prussian War — occurred on August 18th of what year?

1572
1686
1789
1870
1903

The correct answer is 1870