Seventeenth Army
Upon learning of the American landings on Guadalcanal, Imperial General Headquarters on August 10, 1942, ordered the Aoba Detachment undergoing training with the Fourteenth Army to join the Seventeenth Army under General Hyakutake. Three days later, orders were issued to recapture both Guadalcanal and Tulagi, in addition to carrying out the Port Moresby Operation.