World War II in the Pacific: What Combat Conditions Teach About Warfare
Most modern geopolitical conflicts in Asia trace their roots back to the end of World War II in 1945, as Japanese forces that only two years earlier swept through the continent and the Pacific Ocean were rolled backwards by Allied forces. Now 80 years later, the region faces the shadow of another global conflict. What lessons does the fighting 80 years ago still offer? In this episode of Zoom In Zoom Out, military historian John C. McManus discusses the combat and logistics that brought the Allies to victory 80 years ago, as armies fought through terrain that was as much an opponent as the enemy.
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Eight decades after the Allied victory over the Japanese Empire, lessons from the Pacific War remain strikingly relevant, says historian John C. McManus.
Between 1940 and 1942, Japanese forces rapidly expanded outward across Asia and the Pacific. “The Western powers of course get into the war against Japan at the end of December, during December 1941. And they are initially overwhelmed, especially that first six to nine months,” McManus said. “The Japanese have more air power, more sea power. Their war plans are better developed.”
From 1943, however, the momentum shifted. “Once you see the Allies begin to have counteroffensives, gain the momentum on their side, you’re going to see a lot of jungle fighting, especially in New Guinea, Guadalcanal, ” he said.
Later on, the campaign also brought brutal cave warfare in places such as Iwo Jima and Okinawa as the Allies closed in on the Japanese home islands.
“Tactics change in terms of how the Allies are armed, especially the Americans I’m talking about here,” McManus said. “A lot more flamethrower teams, more bazooka teams, more use of armor, more satchel charges of explosives to fight in, close in, in caves and bunkers and pillboxes.”
Logistics presented another formidable challenge. “It really is an incredible challenge,” McManus said. “The Pacific Asia Theater is about a third of the world’s surface of ocean and continents and islands. And so it’s very, very difficult to move stuff from point A to point B. Shipping is everything.” He noted that the US Army was forced to run its own fleet of transports and barges to keep pace.
Disease compounded the difficulties. “In 1943, MacArthur’s theater, known as the Southwest Pacific Area, is losing about four to five guys to disease for every one who becomes a casualty in combat against the Japanese,” McManus said.
Malaria and yellow fever sidelined thousands of troops. The drug atabrine became the key to keeping soldiers in the field.
In the steamy Pacific climate, wounds worsened quickly. “There’s a serious problem with wounds getting infected,” McManus said, describing how antibiotics such as penicillin and sulfanilamide helped save lives.
Combat medics had to adapt as well. “It’s more likely that your wounded soldiers are going to bleed out versus in cold conditions where you don’t bleed out quite as quickly,” he said.
Rivalries also shaped the conflict. In the United States, an “uneasy compromise” divided command between General Douglas MacArthur in the Southwest Pacific and Admiral Chester Nimitz across the Central, North and South Pacific. By contrast, McManus said, Japan’s army and navy often worked at cross purposes. “The Imperial Japanese Army tends to have senior officers that are a bit more nationalist extremists than are the Imperial Japanese Navy officers,” he said. “The Imperial Army sees the Asian continent as the answer. The Imperial Navy, by contrast, sees the Great Pacific out there as the answer.”
McManus argues that the Pacific War is often misunderstood as a purely naval struggle. “There’s a kind of mythology to this day that the war against Japan was really just a maritime war,” he said. “But in the end, human beings are terrestrial creatures, and the ground had to be taken and held and somebody had to do it. That required a major army of 1.8 million US Army ground soldiers.”
Looking to today’s rising tensions in Asia, McManus said the lessons remain clear. “Most human conflict comes down to ground fighting,” he said. “These aren’t just idle factoids from 80 years ago. I think these are really relevant lessons to us today.”
