Marching Orders: The Untold Story of How the American Breaking of the Japanese Secret Codes Led to the Defeat of Nazi Germany and Japan

by Bruce Lee

With the beginning of July, General Marshall learns just how effective the U.S. Navy’s submarines have been in the South Pacific. A message from Saigon to Tokyo reveals that the Japanese naval authorities are now so worried about sinkings that, in the future, “no ship will be allowed to travel except in convoy.”38 This is the first report from any Japanese source indicating that the loss of ships has become a prime worry for Tokyo.