WWII Pictures on Twitter: "Portrait of German U-boat commander Robert Gysae, seen here after a long patrol on sea. #WW2 https://t.co/U8vblWf3hq" / Twitter
Günther Prien - Wikipedia
D80148 WWII German U-Boat Commander- Lehmann – DID Corp.
Herbert Schultze - Wikipedia
Reinhard Hardegen, Who Led U-Boats to America's Shore, Dies at 105 - The New York Times
D80148 WWII German U-Boat Commander- Lehmann – DID Corp.