10 September

Western Front

 * Battle of the Marne ended. Germans retreat on west and centre.
 * Pont-à-Mousson evacuated by Germans.

Eastern Front

 * Poland: Dankl defeated in second Battle of Krasnik, Archduke Joseph defeated at Opole.

Southern Front

 * Syrmia: Serbians occupy Semlin.

Naval and Overseas Operations

 * East Africa: Germans occupy Kisi.
 * The Emden makes first appearance in Bay of Bengal.