Battle of Nanking
The Japanese forces defending Bougainville were part of General Harukichi Hyakutake's 17th Army, with the main infantry forces being drawn from the experienced 6th Division, under Lieutenant General Masatane Kanda. This formation had previously fought in China, including the Battle of Nanking. It was supported by the 4th South Seas Garrison Unit. In addition, elements of the 17th Division were scheduled to reinforce northern Bougainville in mid-November, and ultimately they played no part in repelling the landings at Cape Torokina on 1–3 November. The forces on Bougainville reported to the Eighth Area Army, under General Hitoshi Imamura, at Rabaul.