The Japanese forces defending Bougainville were part of General Harukichi Hyakutake's 17th Army, with the main infantry forces being drawn from the 6th Division, under Lieutenant General Masatane Kanda, supported by the 4th South Seas Garrison Unit.
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, and was supported by the 4th South Seas Garrison Unit.