violating the neutrality of Thailand, with whom a non-aggression pact had been signed the previous year. Concern regarding the situation prompted the government in London to send Duff Cooper as a special cabinet envoy. Cooper's arrival in September 1941, did not help to maintain Brooke-Popham's authority in a difficult situation. On 22 November, with the Japanese establishing sea and air bases in southern Indo-China, Brooke-Popham urged London that Matador should be put into effect, granting him permission to advance into southern Thailand. Brooke-Popham did eventually receive permission on 5 December although many conditions were attached. The plan was reworked to take account of the limited forces available and on 8 December the war with Japan began. Two days before the Malayan Campaign began, Hudsons of No.1 Squadron (RAAF) spotted the Japanese invasion fleet but given uncertainty about the ships' destination and instructions to avoid offensive operations until attacks were made against friendly territory, Brooke-Popham did not allow the convoy to be bombed. Although it had been agreed in London that Brooke-Popham should be replaced as commander-in-chief on 1 November 1941, the change was not made because of the critical situation. With the war with Japan now unfolding, many believed that Brooke-Popham was near to a nervous collapse. The cabinet envoy Duff Cooper urged his replacement and London agreed. On 27 December, at the height of the Battle of Malaya, Brooke-Popham handed over command to Lieutenant-General Sir Henry Pownall. Brooke-Popham's return to Britain was closely followed by the fall of Singapore on 15 February 1942. Inevitably, Brooke-Popham was associated with the collapse and he was publicly attacked by some in Britain as the man chiefly responsible for the defeat. Later war years In May 1942, Brooke-Popham retired from active service in the RAF for the second time. His reputation severely damaged by the events in the Far East, he nevertheless continued to serve where he could. At some stage in 1942, Brooke-Popham became Inspector-General of the Air Training Corps, a position he held until 1945. From 1944 to 1946, he served as President of the Navy, Army and Air Force Institutes Council. Later years After Brooke-Popham relinquished his role as President of the Navy, Army and Air Force Institutes Council, he lived in retirement. Brooke-Popham died in the hospital at RAF Halton in Buckinghamshire on 20 October 1953. His funeral took place at St. Edburg's Church in Bicester and he was