27,000 French soldiers were killed on the first day of the Battle of Frontiers.

The Lusitania was sunk, killing 1198 civilians, including 128 Americans.

The Battle of Verdun lasted 10 months and ended with 700,000 casualties.

The Battle of the Argonne Forest was a turning point for the Allied victory.

The Battle Tannenburg was a huge victory for the Germans along the Eastern Front.

On November 11, 1918, an armistice was reached.