The confrontation was an undeclared war Hostile_encounter with most of the action occurring Coming_to_be in the border area between Indonesia and East Malaysia on the island of Borneo ( known as Kalimantan in Indonesia ) .

To deter and disrupt Destroying Indonesia 's growing Expansion campaign of infiltrations Attack , the British responded Response in 1964 by launching Motion their own covert operations into Indonesian Kalimantan under the code name Operation Claret .

A build-up of Indonesian forces Military_operation on the Kalimantan border in December 1964 saw Self_motion the UK commit Commitment significant forces Military_operation from the UK-based Army Strategic Command and Australia and New Zealand deployed Arranging roulement combat Hostile_encounter forces Military_operation from West Malaysia to Borneo in 1965–66 .

Zone Kalimantan and Sulawesi-Papua divided Change into two group each filled Filling with four teams , the top two teams in each zone qualifying Participation for the tournament Competition proper .