USN Fleet Destroyer vs IJN Fleet SubmarineLeading up to the Pacific War, Japanese naval strategists believed that a decisive fleet engagement would be fought against the United States Navy. Outnumbered by the USN, the Imperial Japanese Navy planned to use its large, ocean going submarines to chip away at its opponent before the grand battle. In order to accomplish this, the IJNs submarine force was tasked to perform extended reconnaissance of the USNs battle fleet, even in port, and then