Https://www.cargomaster.com.au/wp-content/uploads/2012/08/img_slider_05-564x350.jpgAllied submarines didn't adopt a defensive posture and anticipate the enemy to assault. Inside several hours with the Pearl Harbor assault, in retribution towards Japan, Roosevelt promulgated a completely new doctrine: unrestricted submarine warfare versus Japan. This meant sinking any warship, commerci... http://Conservablogs.com