What were the dates of the German invasion on Poland during WWII ?
18 October – 19 October — WWII : Thirty - two ships are sunk from Convoy SC 7 and Convoy HX 79 by the most effective wolfpack of the war including U-boat aces Kretschmer , Prien and Schepke 11 November — WWII : The German " Hilfskreuzer " ( commerce raider ) " Atlantis " captures top secret British mail , and sends it to Japan .