Not only did Germany limit the size of her fleet, but she failed to push technical developments. For example, she was behind the Allies in developing radar, and her torpedoes were mechanically deficient. She was ahead of the Allies in perfecting magnetic mines, but these proved to be a short-lived advantage… The priority for naval construction was so low that when the war began in September, 1939, the naval strength allowed in the treaty of 1935 had not been reached.
Thus, in the opinion of Admiral Doenitz, Germany, for the second time within 25 years, lost her bid for world supremacy because of her weakness at sea.
Click here to read about an American destroyer on D-Day.