Western Front
French Army Mutinies: The government suppressed the news so as not to alert the Germans, nor depress homefront morale. The extent and intensity of the mutinies were disclosed for the first time in 1967 by Guy Pedroncini in his volume Les Mutineries de 1917. His project had been made possible by the opening of most of the relevant military archives 50 years after the events, a delay in conformity with French War Ministry procedure. However, there are still undisclosed archives on the mutinies, which are believed to contain documents mostly of a political nature; those archives will not be opened to researchers until 100 years after the mutinies, in 2017.
Artois: After 600-projector (mortar) gas barrage Canadian 10th Brigade (over 550 casualties) captures 100 PoWs but cannot hold La Goulette south of river Souchez (until June 25) and Lens.
Loading British gas projectors. The efficacy of the weapon depended on which way the wind blew:
https://i2.wp.com/ww2-weapons.com/w...ctors.jpg?ssl=1
Germans recover ground south of Souchez river.
Flanders: British artillery at Messines begin feint creeping barrage (and on June 5), drawing German guns for counter-battery retaliation.
Intense artillery duel in Wytschaete salient.
Aisne: 5 German Chemin des Dames attacks repelled, another near Hurtebise fails on June 5.
Men of the British 15th division participating in a horse race at Wail, France:
https://twitter.com/CenturyAgoToday...7925504/photo/1
Aerodromes at Zeebrugge, Bruges, etc., again heavily bombed.
Southern Front
Tenth Battle of the Isonzo: Austro-Hungarians repulsed on San Marco (east of Gorizia). They open a great counter-offensive on the Carso.
Naval and Overseas Operations
U-boat
UC-72 sinks Uruguayan ship
Rosario.
German minesweeper
M75 in drydock for repairs after hitting a mine:
https://twitter.com/CenturyAgoToday...6200320/photo/1
Austro-Hungarian torpedo-boat sunk by submarine. (Maybe-I can find no other record of an Austro-Hungarian ship loss for this date. However, there is a record of SMS
Wildfang being mined and sunk on 4 June).
Asiatic and Egyptian Theaters
Mesopotamia: Falkenhayn reports offensive against Baghdad feasible.
Arabia: Lawrence leaves Nebk (with two local guides) to sound Syria Arabian tribes (until June 16), blows bridge on Aleppo-Damascus railway near Baalbek, apparently meets Turkish Damascus commandant (highest-ranking Arab General Ali Riza Rikabi) outside city.
Political, etc
Germany: After negotiations, Germany agrees to keep British prisoners of war at least 15 miles away from the frontlines, out of artillery range.
German Aeronautical Club announces plans to establish a Zeppelin route to carry mail and passengers between Berlin and Constantinople.
United Kingdom: Around eleven hundred British Socialist delegates gather in Leeds, urging peace with Germany without any annexations.
Italy: Government proclaims protectorate over an “independent” Albania.
China: Provisional Government formed in China, as at least 11 Chinese provinces are in revolt, as the government becomes split over whether to declare war on Germany.