Battle of Saint-Mihiel

The Battle of Saint-Mihiel was a major World War I battle fought from 12–15 September 1918, involving the American Expeditionary Forces and 110,000 French troops under the command of General John J. Pershing of the United States against German positions. The U.S. Army Air Service played a significant role in this action.

This battle marked the first use of the terms "D-Day" and "H-Hour" by the Americans.

The attack at the Saint-Mihiel salient was part of a plan by Pershing in which he hoped that the Americans would break through the German lines and capture the fortified city of Metz.

Source: Wikipedia