4 Apr 1940
- Aktion 14 F 13 began; it was the first documented proof that the Nazi German regime conducted mass extermination of the handicapped in concentration camps. ww2dbase [Main Article | CPC]
- British newspapers reported concentrations of troops in German ports. ww2dbase [CPC]
- British Vice Admiral Max Horton ordered British submarine HMS Snapper to depart Harwich naval base for the Skagerrak between Denmark and Norway and French submarines Amazone and Antiope (under British command) to depart Harwich for the Frisian Islands and Heligoland. ww2dbase [CPC]
- Winston Churchill traveled to Paris, France to persuade the French on a plan to mine Norwegian waters. Unable to convince French leadership to mine the Rhine River at the same time, Churchill decided that the British would mine Norwegian waters without French cooperation. ww2dbase [Main Article | CPC]
- The Netherlands declared itself in a state of siege. ww2dbase [TH]
Timeline Section Founder: Thomas Houlihan
Contributors: Alan Chanter, C. Peter Chen, Thomas Houlihan, Hugh Martyr, David Stubblebine
Special Thanks: Rory Curtis
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