HMS Hermes. Image courtesy George Grantham Bain collection.
- HMS Hermes is torpedoed by the German submarine U-27 in the Straits of Dover. She sinks and 22 of her crewman perish.
- The British Government issue orders for hostilities to commence against Turkey
- The Battle of Gheluvelt ends. Gheluvelt is lost and recaptured; the British line is broken and restored.
- The first units of Indian Expeditionary Force “B” arrive at Mombasa in British East Africa
- Brigadier-General Arthur Aitken assumes command of British forces in East Africa, succeeding Brigadier-General JM Stewart
- The British cruiser HMS Chatham discovers the German light cruiser Konigsberg in the Rufiji River delta in German East Africa. Reputedly the most powerful German ship in the Indian Ocean at the time the Konigsberg was waiting for machinery damages to be repaired. British ships blockade the Konigsberg.
- British Secretary of State for War, Lord Kitchener, sends a conditional guarantee of Arabian independence to Hussein bin Ali, Sharif of Mecca
