Western Front
French Army Mutinies: Suppression & executions continue; otherwise, no further developments.
Battle of Messines Ridge: British advance on two-mile front east and north-east of Messines.
French Malagasy (Madagascar) soldier at Leuilly-sous-Coucy: © IWM (Q 78452):
https://twitter.com/CenturyAgoToday...252532540821505
Eastern Front
Russian artillery guns renew heavy bombardment of German positions in Galicia and Volhynia.
Southern Front
Trentino: Italian Offensive north of Asiago: No further developments this day.
Salonika: British withdraw back across to river Struma (until June 14) to avoid summer malaria.
Greece: Allied forces occupy Larissa (Thessaly) and Corinth.
Naval and Overseas Operations
German submarine SM
UC-66 is sunk by the HMT
Sea King by a depth charge with loss of all crew.
Asiatic and Egyptian Theaters
Fort of Salif (Red Sea) destroyed by British naval forces.
Armenia: General Prjewalski replaces Yudenich as Russian C-in-C.
Political, etc
United Kingdom: Publication of British reply to Russian Note on war aims, and of French message regarding Russian proclamation of 9 April 1917.
Labour Leader Ramsay Macdonald give up plans to visit Russia due to popular opposition toward his pacifist views.