Comment on The Enemy Below by zulumike

The U-boat campaign of 1940-42 was devastatingly affective against  England at the time, and for a time against the U.S. (from Dec. 1941 to the summer of 1942 U-boats considered their cruises in "Operation Drumbeat" against the U.S. their "happy time" for the number of almost effortless, sitting duck kills.  After the summer of 1942, with growing use of sonar and convoys, it became less so, and by 1943 the reversal really being felt with more and more submarines being sunk.  I believe at the end of the war 8,000 German submariners had been lost trying to continue their fight.