4 September

Western Front

 * Advance of German First Army towards Paris diverted in a south-easterly direction.
 * Belgians open dykes and stop a German advance on Antwerp.

Eastern Front

 * Galicia: The Russians organise a government for the conquered regions.

Political

 * Great Britain: Mr. Asquith gives speech at the Guildhall and justifies Britain's entry into the war. Mr. Law also gives his speech at the Guildhall.