Battle of the Somme: 778 surviving South Africans relieved at Delville Wood. 4 British divisions begin attacks on High Wood (until July 30).
Verdun: Mangin’s French attack in Souville-Thiaumont sector gains ground (and on July 24 and 28).
Brusilov Offensive, Pripet: Sakharov captures Berestechko on river Styr, Galician border, crosses river taking 14,000 PoWs (July 21).
Heir apparent Austrian Archduke Charles in command of Suedarmee, Seventh and Third Armies.
Greece: Greek Army demobilization nearly completed.
Armenia: V Caucasus Corps occupies Ardasa.
Mesopotamia: Shamal northwest wind begins 6 weeks late.
Persia: Niedermayer arrives in Tehran from Afghanistan via Russian Turkestan (invalided home from Baghdad in February 1917).
East Africa: British main body meets troops from Tanga. Anglo-Belgian Entebbe Conference (until July 23).
Lake Tanganyika: Major-General Wahle evacuates Kigoma.
Greece: Government agrees new £800,000 Anglo-French loan.