September

Great War events that took place on 13 September.

1914 (Sunday)

Western Front  ▶  Allies recover Soissons and force the passage of the Aisne there.  ▶  Amiens recovered by the French.  ▶  Germans begin to drive the Belgians back into Antwerp; Battle along line Aerschot-Malines.
Eastern Front East Prussia: Russians turn on their pursuers and defeat them at Sredniki near the Niemen.
Southern Front Serbians and Austrians fighting in both Serbia and Syrmia.
Asiatic and Egyptian Theatres Tsing-tau: Japanese capture the railway at Kiao-chau town.
Naval and Overseas Operations  ▶  Solomon Islands: Australian troops capture Bougainville.  ▶  German cruiser SMS Hela is sunk by British submarine HMS E9.
Political Germany: Herr von Bethmann-Hollweg's reply to Mr. Asquith's Guildhall speech of 4 September published.