18 November

Western Front

 * Fighting limited to artillery duels and local skirmishes.

Eastern Front

 * East Prussia: Russians defeated at Soldau.
 * Poland: Russians in retreat towards Lovich.
 * Galicia: Austro-German offensive from Cracow.

Asiatic and Egyptian Theatres

 * Armenia: Turkish offensive compels Russians to retreat.

Naval and Overseas Operations

 * Libau on Baltic shelled by German squadron.
 * SMS Goeben and SMS Breslau engaged by a Russian squadron in Black Sea: the Goeben damaged.