Spain: German U-boat U35 delivers Kaiser letter to King at Cartagena.
Mexico: 400 Mexican regulars (38 killed) capture US 10th Cavalry troop (40 casualties, including 22 PoWs) at Carrizal. US demands PoW release (June 25, done on June 28).
Greece: Allies demand demobilization and government exchange. Prime Minister Skouloudis resigns, Zaimis succeeds.
East Africa: c.240 British land on Ulenge island (Tanga Bay) and wade to mainland.
Britain: First of three Kipling articles in The Times (and on June 23 and 28) paying tribute to Royal Navy Submarine Service ‘The Trade’.
Turkey: German officials at Islahie railhead treat 39 British Kut PoWs too ill to continue as rest march into Taurus Mts (June 22), reach Adana by train (June 24) then sent back for railway labour.
Germany: War profits taxation law.