26 August

Western Front

 * Battle of Le Cateau: British forced to retreat: Louvain destroyed by the Germans.
 * End of French attempt to recover Alsace-Lorraine: French fall back in St. Dié region.

Eastern Front

 * East Prussia: Soldau retaken by the Germans: Samsonov's communications cut: beginning of the Russian debacle known as Battle of Tannenberg (25 miles south-west of Allenstein).
 * Galicia: Beginning of operations against Lemberg.

Southern Front

 * Novi Bazar evacuated by the Austrians.

Naval and Overseas Operations

 * Togoland conquered by the Allies: town of Atakpame occupied.