Western Front
Battle of Belleau Wood: 3rd Battalion, 5th Marines, under command of Major Maurice E. Shearer, supported by two companies of the 4th Machine Gun Battalion and the 15th Company of the 6th Machine Gun Battalion, made an attack on Belleau Wood, which finally cleared that forest of Germans. On that day, Major Shearer submitted a report simply stating, "Woods now U.S. Marine Corps entirely", ending one of the bloodiest and most ferocious battles U.S. forces would fight in the war.
British take point west of Vieux Berquin (10.5 miles west of Armentieres).
German air-raid on Paris.
11 of 20 D.H.s (1 D.H.4, 2 D.H.9s lost) attack factories and railways at Karlsruhe; a D.H.9 of No 104 Squadron loses its way, violates Swiss border and is brought down by anti-aircraft fire (crew interned). 3 Handley Pages bomb Mannheim, Saarbrücken and Boulay airfields (night June 26-27).
Royal Scots soldiers wearing gas masks in a trench at Meteren: © IWM (Q 6775):
https://twitter.com/CenturyAgoToday...261500152000514
Foreign soldiers serving in the US 310th cavalry getting citizenship at a naturalization ceremony at Forth Ethan Allen, Vermont:
https://twitter.com/CenturyAgoToday...276612359348226
German troops next to a captured 12.5 cm French gun at Mareuil: © IWM (Q 23809):
https://twitter.com/CenturyAgoToday...321915754115072
Naval and Overseas Operations
British Harwich shore-controlled minefield sinks UC-11.
Political, etc
Austria-Hungary: Chancellor or dictator
United Kingdom: Labour Conference in London ends political truce. Prime Minister appeals to women to help harvest.
Women harvesting the potato crop in place of their menfolk who had gone to the front:
https://i1.wp.com/ww2-weapons.com/w...ernte.jpg?ssl=1
House of Lords approves principle of League of Nations.
Strike of aircraft workers.
United States: Sugar rationing, 3lb per head per month (reduced to 2lb on July 26).