三川軍一
In response to the landings on Guadalcanal, the Japanese Imperial General Headquarters (IGH) assigned the Imperial Japanese Army's (IJA) 17th Army, a corps-sized command headquartered at Rabaul under the command of Lieutenant General Harukichi Hyakutake, the task of retaking Guadalcanal. Because of the threat by CAF aircraft, the Imperial Japanese Navy (IJN) was unable to use large, slow transport ships to deliver troops and supplies to the island. Instead, warships based at Rabaul and the Shortland Islands were used to carry forces to Guadalcanal. The Japanese warships, mainly light cruisers and destroyers from the Eighth Fleet under the command of Vice Admiral Gunichi Mikawa, were usually able to make the round trip down "The Slot" to Guadalcanal and back in a single night, thereby minimizing their exposure to CAF air attack. These high speed warship runs to Guadalcanal occurred throughout the campaign and were later called the "Tokyo Express" by Allied forces and "Rat Transportation" by the Japanese.