Diary for Friday, June 21, 1940:
50 German aircraft make scattered night raids over many parts of England, guided by radio beams.
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’).
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).
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.