Here’s What You Need to Remember: World War II-era submarines needed to surface frequently to run their air-breathing diesel engines. ASV radars—even with their short effective range of six to ten ...

Early in World War II, Nazi Germany used its navy to isolate Britain from resupply by sea. Germany capital ships, like the battleship Bismarck, were an important part of that strategy. But it was ...

Here’s What You Need To Remember: Allied pilots were at first taken aback by the new aggressive tactics—but quickly adapted. If a U-Boat chose to remain surfaced and spit out flak, flyers would circle ...