Flanders: French 32nd and 16th Divisions attack near Klein Zillebeke. British 3rd Division advance in Petit Bois south of Wytschaete.
Serbia: Austrians recross river Sava at Belgrade until next day, covered by monitors as Serbs storm heights to south.
Eastern Front: Russians change cipher alphabets, later adopt Caesar cipher, to no avail.
North Sea: Thanks to Room 40, Admiralty warns Jellicoe of imminent German High Seas Fleet sortie.
Baltic: 4 Russian cruisers and a minelayer lay 424 mines at entrance to Gulf of Danzig until next day.
Turkey: Sultan opens Parliament, ex-Khedive of Egypt present.