23 October

Western Front

 * Battle of the Yser: Germans take Lombartzyde, but are again repulsed from Dixmude.
 * Allies lose ground near La Bassée.
 * First Battle of Ypres: Furious attacks near Langemarck.

Eastern Front

 * Poland: Germans abandon siege of Ivangorod: Russians everywhere advance and harrass the retreat. They retake Jaroslau.