During September 1941 the situation worsened with continued sanctions imposed against Japanese trade and became irreversibly worse in October when Lieutenant-General Hideki Tojo became Japanese Prime Minister with the support of the Nippon nations powerful military establishment.

On 5 November Tojo revealed to his inner circle of the offensive plans for a defensive war that he felt was increasingly certain to happen. The eventual plan drawn up by Army and Navy Chiefs of Staff envisaged such a mauling of the western powers that defence perimeter line established based on the abilities of Japanese tenaciousness, operating on interior lines for communications and western casualty counts, could not be breached.

This fallacy became apparent as the course of the war against Japan unfolded. Japan had come to believe that the wars in Europe had weakened the imperialists that the Mikado could pick up an extended East Asian empire at will. The Japanese military hierarchy planned a line of defence based on islands stretching from Rabaul in the Bismarck Archipelago to the Kuriles north of Japan, intending to swallow and digest the insular possessions of France, Britain, Holland, Australia, the Portuguese, and of the United States too, while finishing off the Chinese meal began decades before with the notorious 21 demands.

In 1939 the Japanese navy was the only service which gave to the aircraft carrier a place in its fleet ahead, if not equal of the big battleships. The Japanese conquest of South East Asia showed what could be attempted with superior striking strength at sea and in the air.

On Sunday 7 December the Imperial Japanese Navy hit the American military base at Pearl Harbour with an aerial onslaught. The elements of total war were clearly revealed by the undeclared surprise attack on Pearl Harbour. Itself in line with the practices of total warfare, was also in the Japanese military tradition, for they had begun other wars previously the same way. At a similar time on the Chinese coast the Japanese seized control of the International Settlement at Shanghai, taking possession of the US riverboat Wake, and sinking by gunfire the British gunboat HMS Peterel.

So at the stroke of a small action the British Empire & Commonwealth and the United States were at legally at war with the Japanese over influence in China too. Even though bad weather delayed the Japanese air attack on the US Philippines airfields, the enemy pilots were amazed to catch the American planes on the ground, in neat parade ground rows, when they finally arrived in five hours time after the carrier strike against Hawaii.

The investment of Hong Kong on Christmas Day 1941 came as a grim reminder of the Imperial Japanese projected strength. The elimination of the make-shift British Far East battle fleet based at Singapore, venturing without adequate aerial cover to shell Japanese invasion points in northern Malaya were pounced and overwhelmed by Japanese land-based multi-engined bombers. At another stroke the Japanese had eliminated yet another strong, but small, Allied surface force. One immediate outcome was the establishment on 2 January 1942 of a unified command for the South West Pacific area under British General Wavell, America-British-Dutch-Australia Command.

The British Command in Malaya were prepared, by their ill-judged sense of superiority, for an European style battle that took no account of logical conditions of the Malay Peninsula. An over ill-equipped and wrongly trained army in a hopeless battle. There were only a few roads for suitable motorised supply and troop movement where as the Japanese, by contrast, travelled light often blitzkrieging through the jungle making use of minor roads, dirt tracks and amphibious by-pass actions on the coast.

Where British - Indian, or Australian, troops held strong positions Japanese tanks were employed to force still another retreat and another pursuit of soldiers easily overrun with only the depleted remnants, plus a few lucky soldiers, escaping the enemy envelopment. The Japanese harried their enemy all the way down the Peninsula, and civilian refugees on the roads southward, outflanking the improvised rearguard stops until the final battle for Singapore itself. An inevitable never to be forgotten defeat to European prestige in South East Asia.

Outnumbered in the air and on the sea the Allied forces acquitted themselves honourably but could not hope to stop the Japanese overwhelming thrust into the important oil and resource rich region. The defeat of British led Indian forces and allied troops at the hands of a numerically inferior Asiatic army riding on bicycles, living on rice and in some cases superior weapons was to have fateful post war political and nationalist consequences for the European colonial held Far East.

Yet Malay and the US Philippines were only half of the southern resource area, the Co-Prosperity Sphere of Influence, the other areas being Dutch Indies and Borneo. British Burma too offered more pickings in raw materials and from there would come tungsten, rubber and more oil. The Japanese also saw the seizure of the latter as a way that would cut the Burma Road to China, an Allied lifeline to their long standing adversary. As the Japanese island hopped south during the campaign through the Indonesian Archipelago of islands, air reconnaissance and protection were vital and maintained by Japanese superior numbers from the beginning. It became impossible for Allied warships and other vessels to move without being spotted, plotted, shadowed and assaulted.

After the invasion of Borneo and the Celebes, at Menado paratroopers were combined with the amphibious landings, the main Japanese combined operations gained momentum due to lack of effective overall opposition. From the bases on Celebes the Japanese moved into the Moluccas, and onto the island of Timor where paratroopers were employed. From bases in the South China Sea the Japanese leapfrogged invested Singapore and took Sumatra, accompanied again by paradrops. With Bali under Japanese control Java was isolated from east and west, and each Japanese land invasion sea-transport force destined for battle had powerful cruiser and numerical well-armed destroyer escorts and supported by numerical Carrier Fleet and land-based aircraft of the Army and Navy sweeping aside piecemeal Allied sea surface forces and gaining sufficient air superiority.

The Allies major foothold in the Dutch East Indies was finally destroyed on 19 February 1942 by a wild day of aerial dogfighting over Java, which cost the Allies nearly 75 fighters. Sort of the kinda day that the Luftwaffe had dreamed of during the Battle of Britain. Japanese warships had penetrated into the Indian Ocean, attacked Ceylon (Sri Lanka), Indian coastal targets and merchant shipping, even eventually having midget submarines to raid as far away as Madagascar Island, off the South African coast, and at Sydney Harbour, Australia.

By this time when the Dutch East Indies forces on Java had capitulated other Japanese forces had secured bases along the northern coast of New Guinea and in the Australia territory of the Bismarck Archipelago. In March 1942 the Japanese were regrouping their crack air squadrons, veterans of the China war, at Bali before sending them en route to Rabaul and the east coast of New Guinea for more planned joint operational conquests of expansion.

Here in the South West Pacific during the month of March Japanese amphibious forces had landed on Bougainville, the northern most major island of the Solomon chain using Buin, a town on the south coast, as a jump off point to reach down the Slot to Guadalcanal. The tide of Imperial expanded empire was now reaching full flood. The Japanese high tide of conquest also washed upon the Indian frontier. It was the Australian struggle along the Kokoda Track and at Milne Bay, and the US Marine take over of Guadalcanal that were the levy stops for reclaiming the enemy awash islands of the Pacific.

Elated by these early successes Admiral Yamamoto, the Chief of the Combined Fleet, convinced his superiors to expand further including the objectives of Midway, the Aleutians, and the Solomons, expanding the thin line of sea communications dangerously thinner. Individual Japanese commanders of the new Rising Sun Empire of Asia would go off on wild hunts to enhance their name after easy conquests unrelated to any overall strategic plan and was categorised as "victory disease" by the Japanese themselves.