Billy Bishop Reclaims Record
Jun 1 Canadian ace Billy Bishop downs 6 aircraft over a three-day span, including German ace Paul Bilik, reclaiming his top scoring title from James McCudden
- Jun 1 Chicago White Sox losing 5-4 against NY Yankees, load the bases in 9th with no outs; Chick Gandil lines to Frank Baker who turns a rare game winning triple play
- Jun 3 Boston Red Sox pitcher Dutch Leonard throws his 2nd no-hitter; beats Detroit Tigers, 5-0 at Navin Field
- Jun 3 US Supreme Court in Hammer v. Dagenhart rules child labor laws unconstitutional
- Jun 4 French troops, with the aid of US troops, stop the Germans at Chateau-Thierry as they attempt to cross the Marne
- Jun 6 Battle of Belleau Wood, 1st US victory of WW I
- Jun 8 Nova Aquila, brightest nova since Kepler's nova of 1604, discovered
- Jun 12 1st aerial bombing raid by an American unit, France
- Jun 13 Phillies and Cards tie 8-8 in 19 innings
- Jun 15 1" of snow falls in Northern Pennsylvania
- Jun 22 Circus train rammed by troop train kills 68 (Ivanhoe, Illinois)
- Jun 22 US National Championship Women's Tennis, Forest Hills, NY: Molla Bjurstedt beats Eleanor Goss 6-4, 6-3 for her 4th consecutive US singles title
- Jun 25 Baku-Turkish communist party forms
- Jun 26 The Australian steamer Wimmera is sunk by a mine laid north of Cape Maria van Diemen in 1917 by the German raider Wolf; 26 of its 151 passengers and crew were killed
- Jun 27 Canadian hospital ship HMHS Llandovery Castle sunk by German U-boat off southern Ireland - only 24 of 258 people on board survive (U-boat officers later charged with war crimes) [1]
- Jun 28 1st flight between Hawaiian Islands
- Jun 29 A provisional government opposed to the Bolsheviks establishes itself at Vladivostok, the Russian port on the Sea of Japan
- Jun 30 Prominent US Socialist and Pacifist Eugene Debs is arrested on charges of denouncing the government, a violation of the Espionage Act of 1917