Battle of Java (1942) - Forces

Forces

The Japanese forces were split into two groups: the Eastern Force, with its headquarters at Jolo Island in the Sulu Archipelago, included the 48th Division and the 56th Regimental Group. The Western Force, based at Cam Ranh Bay, French Indochina included the 2nd Division and the 230th Regiment (detached from the 38th Division).

The Allied forces were commanded by the Royal Netherlands East Indies Army (KNIL) commander, General Hein ter Poorten. Although the KNIL forces had, on paper, 25,000 (mostly Indonesian) well-armed troops, many were poorly trained. The KNIL forces were deployed in four sub-commands: Batavia (Jakarta) area (two regiments); north central Java (one regiment); south Java (one regiment) and; east Java, one regiment.

The British, Australian and United States units were commanded by British Major General H. D. W. Sitwell. The British forces were predominantly anti-aircraft units: the 77th Heavy AA Regiment, 21st Light AA Regiment and 48th Light AA Regiment. The only British armoured unit on Java was a squadron of light tanks from the British 3rd Hussars. Two British AA regiments without guns, the 6th Heavy AA Regt and the 35th Light AA Regiment were equipped as infantry to defend airfields. The British also had transport and administrative units.

The Australian formation — named "Blackforce" after its commander, Brigadier Arthur Blackburn V.C. — included the Australian 2/3rd Machine Gun Battalion, the Australian 2/2nd Pioneer Battalion, a company from the Royal Australian Engineers, a platoon from the 2/1st Headquarters Guard Battalion, about 100 reinforcements diverted on route to Singapore, a handful of soldiers who had escaped from Singapore following its fall to the Japanese, two transport companies, a casualty clearing station, and a company headquarters unit. Blackburn decided to re-organise his troops as an infantry brigade. They were well-equipped in terms of Bren guns, light armoured cars, and trucks, but they had few rifles, submachineguns, anti-tank rifles, mortars, grenades, radio equipment or Bren gun carriers. Blackburn managed to assemble an HQ staff and three infantry battalions based on the 2/3rd Machine Gun, the 2/2nd Pioneers, and a mixed "Reserve Group". The only U.S. ground forces in Java, the 2nd Battalion of the 131st Field Artillery (a Texas National Guard unit) was also attached to Black Force.