In 1942, American convoys in the Atlantic were connecting troops and supplies to the Allied efforts in Europe and the Soviet Union. But first, they had to sail past the German U-boats (submarines), which were skilled at picking off stray, laggard, and disabled vessels. These were under the command of Admiral Karl Doenitz. Meanwhile, in Africa, Allied troop commanders would soon engage in campaigns against Germany and its famed desert commander, Rommel. In the Pacific, the U.S. Navy and Marines were taking the fight to the Japanese across a vast swath of blue water, as well as in the jungles and on the beachheads of Guadalcanal, Papua New Guinea, the Solomon Islands, and beyond.