June 1917

June 1 – French Army Mutinies 

A French infantry regiment seizes Missy-aux-Bois and declares an anti-war military government. Other French army troops soon apprehend them.

June 4 – First Pulitzer Prizes

The first Pulitzer Prizes are awarded: Laura E. Richards, Maud Howe Elliott and Florence Hall receive the first Pulitzer for a biography (for Julia Ward Howe). Jean Jules Jusserand receives the first Pulitzer for history for his work With Americans of Past and Present Days. Herbert Bayard Swope receives the first Pulitzer for journalism for his work for the New York World.

June 5 – WWI: Conscription begins in the United States.

June 7 – WWI: Battle of Messines opens with the British Army detonating 19 ammonal mines under the German lines, killing 10,000 in the deadliest deliberate non-nuclear man-made explosion in history.

June 8 – Speculator Mine disaster: A fire at the Granite Mountain and Speculator ore mine outside Butte, Montana kills at least 168 workers.
 
June 11 – King Constantine I of Greece abdicates for the first time, being succeeded by his son Alexander.

June 13 – WWI: The first major German bombing raid on London by fixed-wing aircraft leaves 162 dead and 432 injured.

June 15 – The United States enacts the Espionage Act.