Short answers, pulled from the story.
The Borneo campaign, also called the Second Battle of Borneo, was the last major Allied campaign in the South West Pacific Area during World War II. Conducted under the name Operation Oboe, it consisted of a series of amphibious assaults between the 1st of May and the 21st of July 1945, aimed at liberating British and Dutch Borneo from Japanese occupation.
Lieutenant-General Leslie Morshead commanded the Australian I Corps, the main Allied ground force in the campaign. The corps included the 7th Division under Major General Edward Milford and the 9th Division under Major General George Wootten.
The campaign involved landings at four locations: Tarakan (the 1st of May 1945), Labuan and the Brunei coast (the 10th of June 1945), and Balikpapan (the 1st of July 1945). Balikpapan was the last major amphibious assault of World War II.
Allied casualties across the entire campaign totalled about 2,100. Japanese casualties reached about 4,700. At Tarakan alone, 225 Australians were killed and 669 wounded, while 1,540 Japanese were killed and 252 captured.
Historians including Max Hastings argued that Japanese forces in Borneo were already cut off from Japan and could have been contained until their nation's surrender forced them to lay down arms. Pre-invasion bombardments heavily damaged the oil facilities the campaign aimed to capture, making the strategic gains negligible.
Special Operations Australia organised Dayak tribesmen and other local fighters through Operation Agas in British North Borneo and Operation Semut in Sarawak. Over 100 Allied personnel were inserted into Sarawak from March 1945, and guerrilla forces are estimated to have killed over 1,800 Japanese across north Borneo.