Twenty Million Tons Under the Sea

Daniel Gallery, in his brilliant memoir, explains how he led Task Group 21.12 in the battle against the U-Boat threat.
Commanding the USS Guadalcanal he led his crew to sink three of these menacing submarines, but his greatest achievement was to capture the U-505 off the coast of Africa.
He was the first American officer to capture an enemy warship since the War of 1812, and this victory gave the United States Navy not only a great victory but also the codebooks, Enigma machine and other secret materials found on board critically assisted the Allied codebreakers. 

“Excellent in several ways: it provides a fine quick survey of the whole Atlantic war, it describes the operation of the German U-boat service, and, most dramatically, it tells how an American task force under Admiral Gallery achieved the unique feat of capturing a German submarine.” — Publishers’ Weekly