Events occurring on Monday, April 21, 1941  
  The German Invasion of Greece  
  The final decision for the evacuation of the Commonwealth forces to Crete and Egypt was taken, and General Archibald P. Wavell, in confirmation of verbal instructions, sent his written orders to Lt. General Sir Henry Maitland Wilson, the commander of “W” force in Greece.  
   
  General Georgios Tsolakoglou, against orders from the high command, capitulated to SS Obergruppenführer Josef “Sepp” Dietrich by signing surrender papers in Larissa. This capitulation with the German forces was partly due to the understanding with Generalfeldmarschall S. Wilhelm List, that Italian forces should not be allowed south across the border into Greece and the Greek army would not surrender to them. Some men of the SS-LAH forcefully tried to stop the Italians from moving further. This was a humiliating blow to Italian Prime Minister Benito Mussolini who had been desperate to beat the Greeks before the German intervention. Mussolini immediately warned the German Military Attache in Rome that he would observe the ceasefire only if the Greeks came to terms with the Italians too. With reluctance, German Chancellor Adolf Hitler decided to help Mussolini once again, so a second surrender was signed up in Salonica on April 23,1941 that included the Italians.  
   
  The Germans captured the port of Volos. The British had re-embarked numerous units during at Volos during the previous few days but left behind large quantities of diesel and crude oil.  
   
  The Battle of the Atlantic  
  The unescorted British steam merchant Calchas was torpedoed and sunk by the U-107, commanded by Kapitänleutnant Günter Hessler, north of the Cape Verde Islands in the eastern Atlantic Ocean. Of the ship’s complement, 24 died and 89 survivors reached land by lifeboat. The 10,305 ton Calchas was carrying general cargo, including wheat, butter, flour, and steel billets and was bound for Liverpool, England.  
   
  The Pacific Before Pearl Harbor  
  American, British, and Dutch military officials began a meeting in Singapore to develop a strategic plan for combined operations against Japan in the event the Japanese attacked the United States.  
   
  The United States Navy  
  The battleship USS Arizona (BB 39) and the destroyer USS Davis (DD 395) collided while fueling during exercises in Hawaiian Operating Area.  
   
  Ships Commissioned  
  A ship's commissioning was when the ship was handed over, post fittings and trials, to the end user which, in this case, was a combatant navy.  
  The submarine USS Gudgeon (SS 211) was commissioned. Her first commander was Lt. Commander Elton W. Grenfell.  
     
   
  April 1941 Calendar  
   
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