Wolf pack

The termextensive radio communication to coordinate the attacks. This left the U-boats vulnerable to a device called the High Frequency Direction Finder (HF/DF or "Huff-Duff") which allowed Allied naval forces to determine the location of the enemy boats transmitting and attack them. Also, effective air cover, both long-range planes with radar, and [[ i like cows ja:群狼作戦 pl:Wilcze stado sr:Вучји чопор tr:Wolfpack