24 August

Western Front

 * General Retreat from the Line of the Sambre and the Meuse.
 * British fall back from Mons.
 * Germans massacre civilians at Dinant and occupy Tournai, but driven from Malines.
 * French offensive north of Nancy.

Eastern Front

 * Russia completes its general mobilization. Russians advancing in East Prussia.
 * Austrians advance in Poland beyond Kyeltsi.

Naval and Overseas Operations

 * Cattaro, Austrian Adriatic port, bombarded by Franco-British fleet.