Aboard the HMS Walker in the North Atlantic · March 17, 1941 On this date in 1941 U-99, skippered by Otto Kretschmer, one of Germany’s most famous U‑boat commanders, had just fired the last of her torpedoes when she was spotted by a British destroyer southeast of Iceland. By this time Kretschmer, on his eighth…
London, England · March 6, 1941 By January 1941 the Allies had lost 1,300 merchant vessels, almost half of them to German U‑boats. Following the enslavement of 120 million people in seven Western and Eastern European countries by Nazi Germany the previous year, the British were reduced to fighting Adolf Hitler’s military juggernaut alone. In…
London, England · January 21, 1943 Arguably one of Germany’s greatest assets early in World War II was the Enigma machine. It could encrypt and decrypt sensitive diplomatic and military messages in billions of ways (actually 10 to the 23rd power). The location of U‑boats in the Atlantic, supply convoys, and the orders of battle were…
London, England · January 3, 1943 By the end of 1942 U-boats operating from ports in Germany and occupied Europe had sunk just over 1,160 ships (see Battle of the Atlantic). U‑boats claimed nearly 70 percent of all Allied and neutral shipping losses (about 7.8 million tons), and the Kriegsmarine appeared to be winning the tonnage race,…
London, England · December 26, 1943 The Scharnhorst was a German capital ship, variously described as a battleship and battlecruiser of the German Kriegsmarine. Launched in 1936 and completed in 1939—her nine-gun, triple turrets the pride of the Kriegsmarine—the 31,500‑ton ship was sister ship to the Gneisenau. During much of the early part of the…
Washington, D.C. · December 20, 1940 On this date in 1940 President Franklin D. Roosevelt appointed William Knudsen to head a four-member board (Office of Production Management, or OPM) to plan for national defense and coordinate aid to Great Britain following Germany’s total blockade of that island nation in mid-August (Battle of the Atlantic). A…
Berlin, Germany · December 13, 1941 On this day in 1941, two days after Germany and the U.S. had declared war on each other, U‑boat Adm. Karl Doenitz initiated the Kriegsmarine’s wolf pack campaign against ill-prepared merchant shipping along the Canadian and U.S. eastern seaboards. (Wolf packs consisted of a group of U‑boats systematically attacking Allied…
Berlin, Germany · November 29, 1939 On this date in 1939, nearly three months after the German Wehrmacht overran neighboring Poland, launching World War II in Europe, German dictator Adolf Hitler issued Fuehrer Directive Number 9, the first of two directives on measures his country would have to take to render the British economy and infrastructure incapable…
Washington, D.C. · October 17, 1941 Starting on September 1, 1941, two years into the Battle of the Atlantic, U.S. warships began escorting convoys of Britain-bound merchantmen from the North American coast. Convoys departed from Newfoundland off the coast of Canada and ended in the mid-Atlantic at Iceland. Four days after initiating the escort service,…
Washington, D.C. · October 2, 1939 On January 31, 1939, President Franklin D. Roosevelt held a closed-door meeting with the Senate Military Affairs Committee at the White House. Reportedly FDR made the comment that “the frontier of the United States is the Rhine,” meaning France’s eastern border with Nazi Germany. When the statement was leaked…
