In January 1942 German U-boats prowling off the East Coast sank 48 ships of 276,795 tons; in February, 73 ships of 429,891 tons; and in March, 95 ships of 534,064 tons. The Navy did not sink its first German submarine until April 1942. Williamson Murray and Allan B. Millett, A War to Be Won 250 (Cambridge, Mass.: Harvard University Press, 2000).
