USMA the War with Japan.Pt.1 1941-12 1942.08.Pdf
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THE COMMAND AND GENERAL STAFF COLLEGE LIBRARY 940.542 U57w 1950 Call Number CGSC Form 154 (Rev) 22 Oct 52 USACGSC—PO-3396—1 Apr 60—5M RCftfRICTED THE WAR WITH JAPAN PART 1 (December 1941 to August 1942) mnn urn mt BY TAG m mmu DEPARTMENT OP MILITARY ART AND ENGINEERING UNITED STATES MILITARY ACADEMY WEST POINT, NEW YORK 195O REQTIUOTHD THE WAR WITH JAPAN PART 1 (December 1941 to August 1942) DEPARTMENT OF MILITARY ART AND ENGINEERING UNITED STATES MILITARY ACADEMY WEST POINT, NEW YORK 195O %\ (\ \! REOTRIOTBD PREFACE This account of the war with Japan has been written for use in the instruction of cadets at the United States Military Academy. It is based for the most part on material furnished by the Historical Division, Department of the Army. Much valuable information has been obtained from the publications of the United States Stra tegic Bombing Survey and the Office of Naval Intelligence. How ever, in acknowledging indebtedness to others it is not desired to place on them the responsibility for any factual errors or for any conclusions drawn. This and other pamphlets on World War II are constantly being revised as additional information becomes available. It will be ap preciated if military personnel who note any apparent errors or dis crepancies, or who have comments or suggestions for the improve ment of the subject matter, will communicate them to: The Professor of Military Art and Engineering U. S. Military Academy West Point, N. Y. August 1947 ARMY-USMA. WEST PDINT. N.Y. 225O 4-3-5O CONTENTS PAGE INTRODUCTION 1 STRATEGIC CONSIDERATIONS 2 JAPANESE WAR PLAN 8 JAPANESE STRATEGIC OFFENSIVE y 10 InitiaLPlaris and Preparations 10 Central Pacific Operations 14 Pearl. Harbor ... " 14 Midway 29 Wake 29 Guam 30 Operations in East Asia 30 Hong Kong 30 Malaya, British Borneo, Thailand 32 Comments 43 First Philippine Campaign 46 Luzon 50 Visayas-Mindanao 82 Comments 84 First Burma Campaign 87 Comments 92 Conquest of the Netherlands East Indies ^ 93 Comments 104 South Seas Offensive 105 THE ALLIED REORGANIZATION 108 THE ALLIED DEFENSIVE-OFFENSIVE Ill Southwest Pacific Area Il l Pacific Ocean Areas 115 Raids by Naval Task Forces 116 Doolittle's Raid 116 Midway 117 Aleutians 121 GENERAL COMMENTS ON THE WAR UP TO 7 AUGUST 1942 . 123 REOTRICTED THE WAR WITH JAPAN PART I INTRODUCTION Japan's entry into World War II came at the end of a ten-year period of military conquest in Asia. In 1931 the Japanese overran all of Manchuria, and during the succeeding years they continually sought further territorial expansion in northern China (Map 1). United under the Central Government of Generalissimo Chiang Kai-shek, the Chinese people finally offered an adamant resistance to any further encroachment by Japan. The crisis came in July 1937, when Japan inaugurated the Sino- Japanese War* with an ambitious offensive calculated to reduce China to submission. Although large areas were easily overrun in 1937 and 1938, the Japanese found that they could not break the Chinese will to resist (Map 2). The seizure of Canton in late 1938 not only deprived China of a major port but isolated the British possession of Hong Kong as well. The fall of Hankow necessitated the shifting of China's capital to Chungking, in the west. In an effort to avoid any wasteful expenditure of strength in the China war Japan, after 1938, resorted to a policy of economic strangulation. During 1939 Hainan and the Spratly Islands were annexed, and strong amphibious expeditions seized all of the major ports along the southeast coast of China. In 1940 Japan's atten tion shifted still farther south; and the Vichy French Government was forced to yield important concessions in Indo-China, including the right of entry of Japanese troops. A treaty was concluded with Thailand; and by the end of the year the Japanese were dangerously close to the Burma Road, last important supply channel from the outside world to China. Japan's formal adherence to the Axis in September 1940 provided still another indication of her ultimate aims (Map 3). * An account of the Sino-Japanese War prior to 7 December 1941 is contained in the appendix. The year 1941 saw no important change in the situation in China. Serving as mediator in a territorial dispute between Thailand and Indo-China, Japan further improved her relations with Thailand by upholding that country's claims. In April she signed a five-year nonaggression pact with Russia. After this momentous diplomatic coup Japan turned southward again and completed her occupation of Indo-China by the end of July. As the United States, Great Britain, and the Netherlands joined in placing an economic em bargo on all trade with Japan, the situation in the Far East became increasingly explosive. The map shows the general situation just prior to the attack on Pearl Harbor. The strategic importance of the many bases acquired by the Japanese during the Sino-Japanese War should be evident. Having secured her flank and rear by diplomatic negotiations with Russia, Japan was now prepared to exploit her already large terri torial conquests by a further advance southward to vast strategic areas possessing the richest supply of natural resources in the Far East. STRATEGIC CONSIDERATIONS The basis of Japan's bid for supremacy in the Far East was armed power. Beginning with the successful seizure of Manchuria in 1931 she displayed a complete disregard for the various treaties drawn up after World War I to insure the maintenance of peace in this hemisphere. While world attention was focused on the rearming of Germany, Japan converted her industries to war production and steadily increased the size and strength of her armed forces. Japan's decision to fight the combined forces of the United States and the British Commonwealth—as well as China and the Nether lands—was neither hasty nor irrational. It had long been obvious to her that the establishment of the "Greater East Asia Co-Prosperity Sphere" would inevitably result in conflict with the Occidental na tions. Unquestionably the crisis was now at hand. The stringent economic restrictions put into effect by the United States meant that Japan could no longer import the necessary raw materials for war production. Complete abandonment of her nationalistic ambitions was unthinkable; the only alternative was to make herself self- sufficient by seizing the rich Southern Resources Area, held only weakly by far-away England and the Netherlands Government in Exile. With a much inferior war potential, Japan did not delude herself into believing that she could defeat the combined forces of the Occi dental powers. To strike at them quickly and devastatingly, when their full strength could not be utilized against her, was her only chance for victory. It was in the timing of her attack that Japan's shrewdly calculated chances of success lay. From the Japanese point of view it was fortunate indeed that events transpiring in Europe favored Germany so heavily. The Nazi cause was ascendant, forcing the anti-Axis powers to the brink of the final precipice. France and the Netherlands were already out of the picture; Britain was fighting for her life in the Middle East; even Soviet Russia was struggling for survival under the relentless impact of the victorious German invasion armies. Never had the opportunity for conquest in the Far East seemed better than in late 1941. Only the United States could offer immediate resis tance of any consequence, and even she was largely preoccupied with the conflict in Europe. Unprepared for war on two fronts, the United States was already committed, through her lend-lease pro gram, to the support of the nations allied against the European Axis. Despite her tremendous potential strength she could not immediately put a large, well-trained force in the field for operations against Japan. Certainly the time was at hand for Japan to act with vigor and celerity if her dream of empire were ever to be realized. It would take several years for the United States and Britain to muster their full strength in the Pacific, precious years during which Japan could seize and develop the immense resources of the Far East and make herself impregnable against counterattack. During four and a half years of campaigning in China the soldiers of Japan had become inured to the rigors of war. Their training had been rounded out with actual combat experience; and their guns, tanks, planes, and other equipment had been tested as only the crucible of real war can test them. The close coordination of land, sea, and air power in joint operations had been mastered. The numerous amphibious attacks against China's seaports had taught many important lessons and had provided invaluable experience for future operations of this type. The increased combat efficiency of Japan's armed forces, as well as the gain in raw materials, had more than offset the comparatively small losses suffered in the fighting against the Chinese. In mid-1941 Japan quietly began to withdraw from China many of her seasoned and well-equipped units, replacing them with newly drafted troops who were generally provided with second-rate equipment. By 7 December the strength of the Japanese Army had increased to 2,400,000 trained men. Available reserves, only partially trained, totaled another 3,000,000. Japan's air fleet consisted of 7,500 planes, 2,675 of which were first-line combat aircraft. The Army and the Navy air forces normally functioned independently of each other and were about equal in strength. The Army air force had 1,375 combat planes; the Navy air force had 1,300, including about 500 carrier-based planes.