23 November

Western Front

 * Ypres heavily bombarded by the Germans, much damage done to the Cathedral and Cloth Hall.
 * British trenches near Festubert attacked; some lost, but recovered.

Eastern Front

 * Poland: Russian line shattered by Mackensen between Rzgov and Kolyushki, south-east of Lodz: critical situation.

Asiatic and Egyptian Theatres

 * Mesopotamia: British troops make formal entry into Basra.

Naval and Overseas Operations

 * Zeebrugge bombarded by British squadron.
 * German submarine U-18 rammed and sunk; its crew saved.

Political

 * Portugal: Congress authorises the Government to intervene on side of Allies when and how it deems proper.