On July 7, 1944, the US Army 27th Infantry Division bore the brunt of the largest Banzai attack of the war. When the smoke cleared and the dust settled, over 4,000 Japanese troops were dead, and American dead and wounded numbered nearly 1,000.
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Banzai!!! -- The Largest of the War (Type 99) - Old Guns Guy -- Hands on History
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Banzai - Warfare History Network
Banzai charge - Wikipedia