The longest continuous military campaign focused on protecting Allied supply lines from U-boats is known as which battle?

• A. Battle of the Mediterranean
• B. Battle of the Arctic
• C. Battle of the Pacific
• D. Battle of the Atlantic

Answer: (A)

Protecting Allied supply lines from U-boats is the Battle of the Atlantic. This was the longest continuous military campaign of World War II, stretching from the war’s outset in 1939 to its end in 1945, as German submarines attempted to sever the vital sea lanes between North America and Europe. The struggle centered on keeping convoys moving across the Atlantic and protecting them with escorts, air cover, and improved anti-submarine tactics and technology, from sonar and radar to codebreaking and long-range aircraft. The scale and duration of this campaign defined Allied shipping and morale, making it the decisive fight to maintain the flow of men, fuel, and materiel to the front. The other theaters—Mediterranean, Arctic routes as part of the Atlantic, and the Pacific—were important in their own rights, but they do not capture the sustained, whole-theater battle to safeguard transatlantic supply lines against the U-boat threat.