A Brief History of WWII
The Pacific War
Jump to: A Brief History of U.S. Army in World War II -- Index | Introduction
The War in Europe | Outbreak of War | The United States Enters the War
North Africa | Sicily and Italy | D-Day -- Cross-Channel Attack
Battles of Attrition | Battle of the Bulge | Final Offensive Against Germany
The Pacific War | Japan on the Offensive | The Tide Turns
Twin Drives to American Victory | Aftermath | Recommended Books
Even before Pearl Harbor, President Franklin D. Roosevelt and the American military chiefs had agreed on a common strategy with Great Britain: Germany, the most powerful and dangerous of the Axis powers, must be defeated first. Only enough military resources would be devoted to the Pacific to hold the Japanese west of an Alaska-Hawaii-Panama defensive line.
Competition for limited resources between the Allied commanders of the European and Pacific theaters was actually less intense than might have been expected. The Pacific was a naval war, and little U.S. offensive naval power was required in the Atlantic besides landing craft. Aside from the U-boats, the Germans posed no threat in Atlantic waters. U-boat defense primarily required many small, fast escort vessels. Then too, almost the entire British Navy was deployed in the Atlantic. Thus, American offensive naval power -- especially the fast carrier task forces -- could be committed to the Pacific war.
More than distance separated the two wars; they differed fundamentally in strategy and command and in the character of the fighting. In Europe the war was planned and conducted in combination with powerful Allies. Strategic decisions had to be argued and agreed to by the American and British chiefs of staff, and, on occasion, even by President Roosevelt and Prime Minister Winston Churchill. Operational planning was conducted, at least at the higher levels, by combined Anglo-American staffs. In the Pacific the United States also had Allies -- Australia and New Zealand. Yet the ratio of U.S. to Allied forces was much higher there than in Europe, and in consequence strategy and planning were almost wholly in American hands.
Eisenhower, the Supreme Commander in Europe, had no counterpart in the Pacific. From the beginning of the war, rivalry between the Army and the Navy marked the conflict. The two services competed for command, territory, and resources. In the vast Pacific, an ocean dotted with thousands of coral islands, there should have been ample room for both. But interservice rivalries and great distances prevented a single unified commander from being named, until General Douglas MacArthur became Supreme Commander, Allied Powers (SCAP), in the last days of the war. Instead, the Pacific was divided into area commands. The two most important were MacArthur's Southwest Pacific Area (SWPA) and Admiral Chester Nimitz's Pacific Ocean Areas (POA). POA, in turn, was subdivided into North Pacific, Central Pacific, and South Pacific commands. Nimitz personally retained command of the Central Pacific.
Fighting in the Pacific was unlike fighting in Europe. The campaigns in Europe were characterized by huge ground forces driving overland into the heart of the enemy's country. Both in MacArthur's SWPA and Nimitz's POA, the Pacific war was a seemingly endless series of amphibious landings and island-hopping campaigns where naval power, air power, and shipping, rather than large and heavy ground forces, were of paramount importance.
Yet for the soldiers and marines who assaulted the countless beaches, the Pacific war was even more brutal and deadly than the war in Europe. Japanese defenders always dug in, reinforced their bunkers with coconut logs, and fought until they were killed. They almost never surrendered. On Betio in the Tarawa Atoll in November 1943 the marines suffered 3,301 casualties, including 900 killed in action, for a bit of coral 3 miles long and 800 yards wide. At Iwo Jima in February and March 1945 the marines lost almost 6,000 dead and over 17,000 wounded and fought for five weeks to take an island less than five miles long. At Iwo no battalion suffered fewer than 50 percent casualties, and many sustained even higher losses. In the southwest Pacific, MacArthur's casualties were proportionately fewer. Fighting on the larger land masses of New Guinea and the Philippines, he had more room to maneuver, and he could almost always "hit 'em where they ain't."
The history of the war in the Pacific falls neatly into three periods. The first six months of the war, from December 1941 to May 1942, were a time of unbroken Japanese military victory. At the-height of Japanese expansion in mid-1942, the tide turned. The period from mid-1942 to mid-1943 saw Japanese strategic thrusts into the south and central Pacific blunted by the carrier battles of the Coral Sea (May 1942) and Midway (June 1942). Limited U.S. offensives in the Solomons and in the Papuan area of eastern New Guinea were launched in the last months of 1942. Both offensives were begun on a shoestring, and both came close to failure. Yet they represented the end of defeat in the Pacific and the first tentative steps toward victory. Those steps became great leaps in 1944 and 1945. Two amphibious offensives developed, as MacArthur advanced across the northern coast of New Guinea into the Philippines and Nimitz island-hopped 2,000 miles across the central Pacific from the Gilbert Islands to Okinawa.
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This text has been converted from "A Brief History of the U.S. Army in World War II" published by the U.S. Army Center for Military History.