Major General William Rupertus, the commander of the 1st Marine Division, predicted that the island would be secured within four days.[10] However, after repeated Imperial Japanese Army defeats in previous island campaigns, Japan had developed new island-defense tactics and well-crafted fortifications, which allowed them to offer stiff resistance[11] and extended the battle to more than two months. The heavily outnumbered Japanese defenders put up such staunch resistance, often fighting to the death in the name of the Japanese Emperor, that the island became known in Japanese as the "Emperor's Island."[12]
In the US, the battle was controversial because of the island's negligible strategic value and the high casualty rate incurred by American troops during the fighting, which exceeded that of all other amphibious operations during the Pacific War.[13] The National Museum of the Marine Corps called it "the bitterest battle of the war for the Marines".[14]
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^[1] Naval History and Heritage Command, "World War II casualties," citing "The Statistics of Diseases and Injuries. vol.3. Washington: Government Printing Office, 1950." Retrieved 2/10/23. "Invasion of Palau Islands: 1171 killed, 101 died of wounds, 1 died as a prisoner."
^[2]"History of the USMC in World War II vol. IV: Western Pacific Operations p. 285, 797. Retrieved 2/10/23. Total for Peleliu island is 1,252 killed, DOW, MIAPD, and 5,274 wounded. Appendix H lists 1,050 killed, 250 died of wounds, 36 missing presumed dead, and 5,450 wounded, including many of those who later died.
^[3]"History of the USMC in World War II vol. IV: Western Pacific Operations p. 285. Retrieved 2/10/23. Total Palau Group: 542 killed and 2,736 wounded or injured in action.
^[4]"Casualty Report Number II" 8 May 1945, p. 65. Retrieved 2/10/23. 424 killed, 179 died of wounds, 9 missing in action, 2,313 wounded and injured in action
^[5] Naval History and Heritage Command, "World War II casualties," citing "The Statistics of Diseases and Injuries. vol.3. Washington: Government Printing Office, 1950." Retrieved 2/10/23. "Invasion of Palau Islands, 185 killed, 10 died of wounds.
^[6]"The History of the Medical Department of the United States Navy in World War II: The Statistics of Diseases and Injuries, Volume 3" p. 84. Retrieved 2/10/23. 699 total battle casualties - 185 killed and 10 died of wounds = 504 wounded and survived. The Marine Corps source linked above references 11, not 10, who died of wounds.
^<ref>[7]"History of the USMC in World War II vol. IV: Western Pacific Operations p. 179, 253. Retrieved 2/10/23. According to American records, the Japanese lost more than 12,000 dead and 300 prisoners on the 3 main islands, excluding several dozen more who survived the initial battle and were captured or killed later.
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