British forces in Borneo included Headquarters (HQ) 3 Commando Brigade in Kuching with responsibility for the western part of Sarawak, 1st, 2nd and 3rd Divisions, and HQ 99 Gurkha Infantry Brigade in Brunei responsible for the East, 4th and 5th Divisions, Brunei and Sabah. These HQs had deployed from Singapore in late 1962 in response to the Brunei Revolt. The ground forces were initially limited to just five UK and Gurkha infantry battalions usually based in Malaya, Singapore and Hong Kong, and an armoured car squadron. The police also deployed several light infantry of Police Field Force companies. However, as additional resources became available the size of the force available to Walker expanded, and by the end of 1964 British forces had grown to approximately 14,000 troops organised into three brigades (increased to four in 1965). The naval effort, under DOBOPS command, was primarily provided by minesweepers used to patrol coastal waters and larger inland waterways around Wallace Bay. A guardship – a frigate or destroyer – was stationed off Tawau.