The longest continuous campaign in World War II was not one land or by air, but rather by sea. In this episode, Erica Lansberg, DPhil, explores the Battle of the Atlantic and how Allied navies and merchant mariners fought fiercely against the threat of German U-Boats.

This is World War II in 2, a series featuring historians and archival footage – in short, educational videos – describing a vast array of topics related to World War II history and events. Subscribe and never miss a video!

WWII in 2 is generously sponsored by the foundation of Goody Two Shoes, Inc.