U-boat hunters
by Robert McQueen Grant · 2003
"In this book, the author explains how the code breakers at the Admiralty's Room 40 were able to break into the German naval codes during the First World War."--Jacket.
British Naval operationsGerman Naval operationsGreat BritainGreat Britain. Royal NavyHistoryNaval operationsNaval operations, BritishNaval operations, GermanSubmarineSubmarines (Ships)World War, 1914-1918Sea control