British troops waiting in a support trench shortly before zero hour, Beaumont Hamel, Battle of the Somme, 1 July 1916. Image courtesy Imperial War Museum ©IWM (Q 64).
- Day 690 of the war
- The Battle of the Somme commences on the Western Front in France
- Vigorous Italian attacks continue north of upper Isonzo in north-eastern Italy
- Turkish troops defeat Russian forces in Persia; the Russians retreat to Kermanshah
