The greatest naval conflict in history occurred during World War II from 1939 to 1945. Author Vince O'Hara offers a truly global perspective of WWII at sea that captures every aspect of a vast naval conflict that involved dozens of nations, more than 15,000 ships, and 43.7 million tons of shipping. Approximately 570,000 lives were lost at sea in those six years.

Here, the naval action begins in the Baltic Sea before dawn on September 1, 1939, when a German battleship opened fire on Polish troops barricaded in a fortress in the port city of Danzig, Poland. Over the ensuing nine months, the conflict spread into Great Britain's home waters of the North Sea, the English Channel, and the eastern Atlantic. One of the most remarkable naval achievements of the war occurred in 1940 during the German invasion of Norway. The Kriegsmarine's successful attack in the face of immensely superior Allied naval forces was the war's first large-scale amphibious operation. As naval activities in Europe expanded into the Mediterranean, the war in the Pacific exploded with the Japanese attack on Pearl Harbor in December 1941. That assault led to a series of critical naval battles between Japan and the US, including Wake Island, Coral Sea, Midway, and Guadalcanal. O'Hara makes clear to listeners that the impact of the naval battles won by the Allies still reverberates today.