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• Hitler set the date of the Denmark and Norway invasion to be 9 Apr 1940. 2 divisions were allocated for Denmark and 6 division for Norway, while a bulk of the German Navy was to support the overall operation. Coordinated support in the air from the Luftwaffe was also planned. ww2dbase [Invasion of Denmark and Norway | CPC]
• British Royal Navy Vice Admiral Max Horton, in charge of submarines operating in Britain, dispatched 9 British submarines, 2 French submarines, and 1 Polish submarine to patrol the waters near Norway and Denmark in anticipation of a German invasion of the two countries. ww2dbase [CPC]
• The towns of Ota, Kuai, Sawano, and Niragawa in Gunma Prefecture, Japan were merged to form a new town of Ota. ww2dbase [CPC]
• The fourth group of the German Kampfgeschwader 55 wing was established. ww2dbase [CPC]

• Chinese troops captured Wuyuan, Suiyuan Province, China. ww2dbase [Battle of Wuyuan | Wuyuan, Suiyuan | CPC]

• Primauguet departed France for Fort-de-France, Martinique. ww2dbase [Primauguet | Fort-de-France, Martinique | CPC]

• The work to convert fleet escort ship F2 was halted. ww2dbase [F2 | CPC]
• Fleet escort ship F7 was assigned to the 25th Submarine Flotilla as a torpedo recovery vessel. ww2dbase [F7 | CPC]
• Fleet escort ship F8 was assigned to the 25th Submarine Flotilla as a torpedo recovery vessel. ww2dbase [F8 | CPC]

• British Overseas Airways Corporation (BOAC), created by Act of Parliament on 24 Nov 1939, took over the activities of British Airways and Imperial Airways. ww2dbase [AC]

• USS Skipjack departed San Diego, California, United States for the Hawaiian Islands area for training exercises. ww2dbase [Skipjack | San Diego, California | CPC]

1 Apr 1940 Interactive Map