1 October

Western Front

 * Battle round Roye: Vain German efforts to break French line.
 * St. Mihiel: French destroy bridge made over Meuse.
 * Antwerp: Fort Waelhem silenced.
 * British Expeditionary Force begins to leave The Aisne and move west and the north.

Eastern Front

 * East Prussian Frontier: Russians recover Augustovo and begin a nine-days' attack (Battle of Augustovo) on the retreating Germans.

Political

 * Italy: Protest against Austrian mine-laying.
 * Turkey: Closing of the Dardanelles.