Politics
Hitler attends Franco-German armistice negotiations in Forest of Compiegne.
Air War
50 German aircraft make scattered night raids over many parts of England, guided by radio beams.
Secret War
Specially equipped RAF Anson aircraft detects radio beam transmitted from Germany in direction of Rolls-Royce works, Derby. Counter-measures are quickly devised against this system (German code name Knickebein, or ‘bent leg’).
Sea War
Atlantic – two U-boats disappear: U-122 (June 21) and U-102 (June 30) missing off North Channel (Irish Sea); possibly sunk by mines. Two ‘Special Service Vessels’ (decoy ships) sunk by U-boats, West of Ireland: Prunella (June 21) and Williamette Valley (June 29).
Neutrals
Romania: King Carol forms ‘National Party’ inc. members of Iron Guard (Jews excluded from membership).
USA: Death of Colonel Thompson, inventor of the Tommy Gun (a sophisticated sub-machine gun), aged 80.