Bulgarians invade Greece and occupy forts on the Struma. National Defense Act authorizes five-year expansion of US Army, but at the same time drastically limits size and authority of US War Department General Staff 4. Beginning of the Brusilov offensive against Austria-Hungary 5. Kitchener, British Secretary of War, loses his life when the cruiser Hampshire, on which he was voyaging to Russia, is sunk off the Orkney Islands, Scotland. Germans capture Fort Vaux in Verdun attack.
Allies demand Greek demobilization.
King Constantine orders demobilization of Greek army. British penetrate German second line, using cavalry. Longueval captured by British. US Navy requested Aluminum Co. of America to develop a suitable alloy for fabrication into Zeppelin-type girders. Pozieres occupied by British.