26 September

Western Front

 * The Aisne: Local combats only.
 * Battle of Albert: Fierce fight from Oise to Somme.
 * St. Mihiel: Vain German efforts to cross the Meuse.
 * Siege of Antwerp begun by the Germans.
 * Indian troops land at Marseilles.

Eastern Front

 * East Prussian Frontier: Battle of the Niemen (26-28 September): Vain German efforts to cross.
 * Siege of Osovyets: Vain German assaults.
 * Galicia: Russians occupy Rzeszov.

Asiatic and Egyptian Theatres

 * Tsing-tau: German outposts driven in.

Naval and Overseas Operations

 * South Africa: British reverse at Sandfontein.