Five Things to Know About Germany's U-Boats-- Part 1: Doenitz and the Wolfpacks

From the August 18, 2014, Marine Corps Times "A New Look" by AP.

1.  WOLVES OF THE SEA

Germany's war on the Allied supply lines focused mainly on the North Atlantic shipping lanes, but the U-boats also ranged into the Gulf of Mexico (the U-166), the Caribbean Sea, the South Atlantic and the Indian Ocean.

The architect of Germany's submarine warfare plan was Grand Admiral Karl Doenitz, who deployed his submarines in groups known as wolfpacks for unrestricted warfare against merchant ships.

--GreGen