30 September

Western Front

 * Battle extends northwards round Roye and Arras.
 * New French army concentrated round Amiens and Lens.
 * French occupy Lille.
 * Antwerp: Waterworks destroyed.

Eastern Front

 * Germans entrench south of Kyeltsi (south-west Poland).

Asiatic and Egyptian Theatres

 * Tsing-tau: German destroyer sunk in the harbour.

Political

 * Great Britain: Reply of British theologians to German published.