15 October

Western Front

 * Ostend and Zeebrugge occupied by the Germans.
 * The Allied lines extended to the Coast.

Eastern Front

 * Poland: First Battle for Warsaw begins along all the line of the Vistula (till 23 October).

Asiatic and Egyptian Theatres

 * Tsing-tau: The beginning of the end. Non-combatants allowed to leave.

Naval and Overseas Operations

 * South Africa: Rebels routed at Ratedraai.
 * North Sea: HMS Hawke sunk by German submarine U-9.