The Second World War's economic struggle extends far beyond the Battle of the Atlantic. Active trade-war theatres include the Arctic, Black Sea, Mediterranean, Indian Ocean, East and South China Seas, and western Pacific. American submarines attack Japanese shipping, while German, Italian, and Japanese submarines operate against Dutch commerce in the Indian Ocean. German merchant traffic offers British submarines fewer targets because blockade already prevents much of it from sailing. Sea control can suppress commerce before a raider ever encounters a ship.
Notable Point · 41:09-42:48
Second World War commerce warfare spans every ocean
The Battle of the Atlantic was only one part of a worldwide struggle over trade involving Allied, Axis, and Japanese submarines from the Arctic to the Pacific.