Events occurring on Tuesday, September 17, 1940  
  Operation Sealion - The Planned German Invasion of Great Britain  
  German Chancellor Adolf Hitler postponed Operation Sea Lion indefinitely.  
   
  The Battle of the Atlantic  
  Sailing with Convoy HX-71, the British steam merchant Tregenna was torpedoed and sunk by the U-65, commanded by Kapitänleutnant Hans-Gerrit von Stockhausen, 78 miles northwest of Rockall in the northern Atlantic Ocean. Of the ship’s complement, 33 died and 4 survivors were picked up by the British steam merchant Filleigh. The 5,242 ton Tregenna was carrying steel and was headed for Newport, England.  
   
  A straggler from Convoy HX-71, the British steam merchant Crown Arun was torpedoed and then sunk by gunfire by the U-99, commanded by Kapitänleutnant Otto Kretschmer, north of Rockall in the northern Atlantic Ocean. Of the ship’s complement, all 25 survived and were picked up by the destroyer HMS Winchelsea (D 46). The 2,372 ton Crown Arun was carrying pit props and was headed for Hull, England.  
   
  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 destroyer USS Lansdale (DD 426) was commissioned. Her first commander was Lt. Commander John D. Connor.  
     
   
  September 1940 Calendar  
   
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