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The Costly Battle for Shuri Castle : Okinawa April 1945

Updated on August 21, 2019
Mark Caruthers profile image

BA University of Arkansas (Fayetteville) Geography & History

Operation Iceberg : The Allied Invasion of Okinawa

The invasion of Okinawa would be the climax of the "island hopping" campaign against the Empire of Japan which that began more than three years earlier. It was the largest and most complex amphibious operation carried out by the American military in the Pacific War, also considered the most fiercely contested action in all the island hopping campaigns that would bring the American armed forces to the very gates of Japan's home islands.

Until the early fall of 1944, the official Allied strategic plan called for the invasion of Formosa rather than Okinawa mostly due to the fact it would be an easier nut to crack. After much debate the plan to invade Formosa was scrapped in favor of assaulting Okinawa. It was concluded that the occupation of Okinawa would cut off the Japanese home islands from their chief oil supply routes from Burma, Borneo, and Sumatra, creating a critical fuel shortage for enemy ships and aircraft as the war with Japan reached its final stage "Operation Downfall."

Surprisingly, if the United States had invaded Okinawa in late 1943, it possibly would have fallen in a matter of hours, because there were very few Japanese soldiers stationed on the island although Japan's air and naval forces most assuredly would have made it difficult for Allied forces to hold the island. Almost six months before the first American ground troops landed on Okinawa, American warplanes from carrier Task Force 58 would descend on the island giving its civilians their first horrific taste of what they were to endure in the months ahead.

Early on the morning of the 10th of October 1944, more than 1,000 Hellcat fighters, Helldiver bombers, and Avenger torpedo bombers from American carriers struck the first major blow to Okinawa's defenses they would strike targets with 500 tons of bombs and thousands of rockets. According to Japanese records 10 transports, thirty merchant ships, and countless other craft were sunk in the harbor of Okinawa's capital, Naha.

Bloody Kakazu Ridge

Two knocked out Sherman tanks on bloody ridge Okinawa May 1945.
Two knocked out Sherman tanks on bloody ridge Okinawa May 1945. | Source
Capital city of Okinawa,Naha, after carrier air attacks its harbor in the background.
Capital city of Okinawa,Naha, after carrier air attacks its harbor in the background. | Source
1st Marines advance on Wana Ridge May 18, 1945.
1st Marines advance on Wana Ridge May 18, 1945. | Source

General Mitsuru Ushijima (July 31, 1887 – June 22, 1945)

General Mitsuru Ushijima would have his troops lie low for a week on Okinawa until American troops had relaxed the vigilance. And then wage a Holy War on American troops to test their will.
General Mitsuru Ushijima would have his troops lie low for a week on Okinawa until American troops had relaxed the vigilance. And then wage a Holy War on American troops to test their will. | Source

April 1, 1945 the Invasion of Okinawa

On the Easter Sunday April 1,1945, Allied forces began to land on the Island of Okinawa. It resulted in the largest casualties of the Pacific War with over 100,000 Japanese casualties and 50,000 casualties for the Allies. When two American Marine and Army divisions landed abreast on Okinawa they faced an estimated 155,000 Japanese armed forces on the ground, it was the most densely populated island invaded during the Pacific War an estimated 500,000 civilians lived in cities, towns, and villages. Thousands of civilians, men and women, would take up arms against American troops and fight along side Japanese soldiers. The total number of citizens who died defending Okinawa from the American invasion will never be known, but their contribution to the battle was substantial. Many citizens would commit suicide rather than surrender to American troops.

The invasion code named "Operation Iceberg" was the largest amphibious attack undertaken during the island hopping operations in the South and Central Pacific during the Second World War. The Allies attacked Okinawa with an overwhelming force of 540,000 men and 1,600 seagoing ships, eclipsing even D-Day in troops, tonnage, and firepower. The American landing was surprisingly easy. Unlike the first hours on Iwo Jima where commanders talked of abandoning the invasion. By 10:00 A.M. on the first they had reached the edge of Yontan airfield without suffering a single casualty. Just thirty minuets later other troops reached the edge of Kadena airfield. By noon both fields were in American hands. By sunset fifty-thousand American troops were ashore.

There were no Japanese planes in the sky, no submarines, no troops in sight. In the northern sector of the island the marines ran upon just fifteen Japanese soldiers. By mid-afternoon fifty thousand American troops were ashore, and the supply ships were beginning to unload their cargos, more or less relaxed because the job seemed so easy. On Okinawa Japanese leaders had completely reversed their tactics. General Ushijima had decided to virtually abandon the airfields and beaches where the Americans would land. He concentrated his forces south and east of Naha, the capital city on the Motobu Peninsula. General Ushijima's troops were so skillfully hidden on the island that the Americans drastically underestimated their numbers. There they remained quietly in their fortified positions as he shells and bombs rained down, to land mostly in the wrong places. The Japanese troops were hunkered down in a honeycomb of caves and terrain that the U.S. Tenth Army Commander, Lieutenant General Simon Bolivar Buckner, called the most formidable fixed position in the history of warfare. Under the organizational name Tenth Army, Buckner's command was made up of four army and three marine divisions. It was Buckner's first major operation completely under his command. He had lead American troops in the recapture of the Alaskan islands of Attu and Kiska in 1942, the only American soil held by Japanese soldiers during the Second World War.

To those few Japanese who believed the war was still winnable, Okinawa was their last chance to stop the Americans, it was the front line of the invasion of their home islands. The island lay within 350 miles of the Japanese homeland and would be used in the future as a base for the follow-on invasion of Japan's southernmost Home Island, Kyushu. To most Japanese generals Okinawa was nothing more than an attempt to delay the Allied invasion of the Japanese Home Islands as long as possible. Although the Japanese commanders on Okinawa had 155,000 troops to defend the island from invasion, there were not nearly enough troops to defend the ground the way the 23,000 troops defended Iwo Jima.

In order to put up the best possible defense, the northern half of Okinawa was left almost completely undefended, and the southern half of the island was turned into four extremely tough hedgehog defense sectors, they offered the best prospect of a robust, attritional defense. The proportion of artillery and mortar to infantry was the highest encountered in Pacific War. For the first time in the Pacific War, the Japanese had ample time to dig elaborate fortifications, much as they had on Iwo Jima, and they also had large numbers of tanks and artillery pieces. Realizing that he could never defend the entire island, General Mitsuru Ushijima centered his defense around the historical capital, Shuri Castle, a medieval fortress of the ancient Ryukyuan Kings, and the steep limestone ridges on which it was built. This position provided the Japanese with a heavy defense line that could be flanked only from the sea. Since the Okinawan hills had long been used as a major artillery training center, the terrain was familiar to most Japanese gunners, and ranges and coordinates for many potential target areas had already been well established.

Task Force 58

Murders row 5 aircraft carriers of Task Force 58
Murders row 5 aircraft carriers of Task Force 58 | Source
Hellcat fighter used in the battle of Okinawa
Hellcat fighter used in the battle of Okinawa | Source
The USS Essex off Okinawa
The USS Essex off Okinawa | Source
The USS Ranger passing through the Panama Canal on the way to the Pacific War.
The USS Ranger passing through the Panama Canal on the way to the Pacific War. | Source
The USS Arkansas shelled the beaches of Okinawa.
The USS Arkansas shelled the beaches of Okinawa. | Source
Flight deck of the USS Ranger.
Flight deck of the USS Ranger. | Source
The Curtis Helldiver a carrier based plane used to bomb cities or surface ships.
The Curtis Helldiver a carrier based plane used to bomb cities or surface ships. | Source
The Avenger torpedo bomber a carrier based plane use to drop torpedoes or conventional bombs.
The Avenger torpedo bomber a carrier based plane use to drop torpedoes or conventional bombs. | Source
The American aircraft carrier USS Bunker Hill
The American aircraft carrier USS Bunker Hill | Source
USS Arkansas with a full view of her six 14-inch cannons April 11,1944.
USS Arkansas with a full view of her six 14-inch cannons April 11,1944. | Source
Task Force 58 off the Majuro Atoll 1944.
Task Force 58 off the Majuro Atoll 1944. | Source

The Battleship Yamato's Kamikaze Attack

The U.S. Navy contributed the bulk of the ships and airplanes in the assault on Okinawa. The total strength of the Allied fleet at Okinawa was over 1,300 ships including 40 carriers, 18 battleships, and 200 destroyers. The U.S. Navy sustained greater casualties in the assault than any other battle of the war. The Japanese had used kamikaze tactics since the Battle of Leyte Gulf but for the first time they became a major part of the defense. During the battle seven major kamikaze attacks were attempted involving over 1,500 planes. The Allied invasion force paid a high price for Okinawa, 79 ships sunk or scrapped, more than 250 damaged, and over 500 aircraft lost.

The most dramatic action of the naval campaign occurred far from the land battle of Okinawa which involved the attempted kamikaze attack by a strike force of Japanese surface vessels led by the 70,000 ton battleship Yamato, the world's largest battleship. The Yamato and other Japanese surface vessels involved Operation Ten-Go were intercepted shortly after leaving Japanese their ports. Under attack from more than 300 carrier aircraft over a two day span the Yamato would be destroyed long before she could reach Okinawa. The massive battleship had been ordered to fight her way through enemy naval forces surrounding the island, and then run herself onto the beach at Okinawa, to use her guns as artillery to shell Allied positions. After the Yamato was sunk the Japanese Navy would cease operations for the remainder of the war.

The Death of Battleship Yamato

 Yamato Class Battleships
Yamato Class Battleships | Source
Yamato explosion soon afterward it sank to the bottom of the ocean.
Yamato explosion soon afterward it sank to the bottom of the ocean. | Source
The Yamato on sea trials in 1941.
The Yamato on sea trials in 1941. | Source
Yamato explosion
Yamato explosion | Source
Yamato hit by bomb
Yamato hit by bomb | Source
Yamato at Sea.
Yamato at Sea. | Source
The Yamato under air attack.
The Yamato under air attack. | Source
The 70,000 ton  Super Battleship Yamato 1945
The 70,000 ton Super Battleship Yamato 1945 | Source
Yamato somewhere in the Pacific.
Yamato somewhere in the Pacific. | Source

Kamikazes Attack the Invasion Force off the Beaches of Okinawa

The Mongol fleet destroyed in a typhoon, ink and water on paper, by Kikuchi Yosai, 1847.
The Mongol fleet destroyed in a typhoon, ink and water on paper, by Kikuchi Yosai, 1847. | Source
May 26, 1945 Corporal Yukio Araki, holding a puppy, and four other pilots of the 72cnd Shinbu Squadron at Bensei, Kagoshima, Araki died the following day, in a suicide attack on ships near Okinawa.
May 26, 1945 Corporal Yukio Araki, holding a puppy, and four other pilots of the 72cnd Shinbu Squadron at Bensei, Kagoshima, Araki died the following day, in a suicide attack on ships near Okinawa. | Source
USS White Plains under attack from kamikaze.
USS White Plains under attack from kamikaze. | Source
USS Intrepid under kamikaze attack.
USS Intrepid under kamikaze attack. | Source
USS Louisville hit by Kamikaze.
USS Louisville hit by Kamikaze. | Source
USS Enterprise off the beaches Okinawa during a kamikaze attack .
USS Enterprise off the beaches Okinawa during a kamikaze attack . | Source
The aircraft carrier Bunker Hill hit by a kamikaze during the Battle of Okinawa.
The aircraft carrier Bunker Hill hit by a kamikaze during the Battle of Okinawa. | Source
USS Columbia attacked by kamikaze off the beaches of Okinawa.
USS Columbia attacked by kamikaze off the beaches of Okinawa. | Source
USS Columbia hit by kamikaze.
USS Columbia hit by kamikaze. | Source
A kamikaze on fire diving toward it target.
A kamikaze on fire diving toward it target. | Source
Chiran high school girls wave kamikaze.
Chiran high school girls wave kamikaze. | Source

Kamikaze Pacific War 1944-45

To understand the reasons why so many Japanese airmen were prepared to carry out kamikaze raids you need to understand the past history of the Imperial Air Force. History tells that the kamikaze were two winds or storms that are said to have saved Japan from the Mongol fleets under Kublai Khan. These fleets attacked Japan in the year 1274, and again in 1281. Due to the growth of Zen Buddhism among Samurai at the time in Japan, those events were the first events where typhoons were described as "divine wind" as much by their timing as by their force. By late 1944 as they attempted to combat the massive Allied juggernaut that was bearing down upon them the Japanese military was a spent force after suffering a series of devastating defeats defending their Pacific empire. At the beginning of the Second World War Japanese aircraft were far superior to the Allied machines . The Zero was an excellent fighter, capable of outmaneuvering and out-shooting the slower and older fighters operated by the Americans and British. Japanese dive-bombers, torpedo-bombers and medium bombers were all extremely effective in the early stages of the war. However, the Allies soon dramatically improved the construction and performance to their aircraft, they constantly developed new types and modifications. While the Japanese made slow progress in design and engineering. They also suffered increasingly from the lack of raw materials, fuel and improvements to their aircraft engines. The loss of skilled airmen from previous battles such as Midway in 1942, whose expertise was irreplaceable would dramatically weaken effectiveness air forces. While the Allies seemed to have an endless supply of airmen and machines.

The gulf grew to such a point between the two advisories that some Japanese pilots were willing to make suicide attacks against American ships, first termed "jibaku" and later known as kamikazes. Obedient to their Emperor and nation their act served a dual purpose, being effective in battle and setting an example of nobility in death. "We must give our lives to the Emperor and country," one kamikaze stated, adding that "This is our inborn feeling." A strong believer in kamikaze tactics was Admiral Onishi, commander of the First Air Fleet defending the islands of the Philippines. On the 19th of October 1944, he formed a Special Attack Corps during the Philippines Campaign as the American Navy surrounded his command. He understood the dramatic advantage the American forces had at their disposal, he suggested that the flight decks of their carriers offered fine targets. The only method that promised success, in his opinion, was suicide missions flown by Zeros carrying 500lb bombs. He told his men that the nation was in great danger and requested their sacrifice "You are already gods," he said, "without earthly desires." The success of the kamikazes caused Japanese leaders to expand the force. The kamikazes were ten times more effective than conventional raids. It was estimated by Allied commanders if they had invaded the home islands of Japan, they would have over 5,000 kamikazes to meet them as they approached the beaches.

Japanese Yokosuka MXY-7 Chka (Cherry Blossom)

Japanese Yokosuka MXY7 Ohka ("Cherry Blossom"), a specially built rocket-powered kamikaze aircraft used towards the end of the Second World War. It was the most feared of the kamikazes because there was no defense against it.
Japanese Yokosuka MXY7 Ohka ("Cherry Blossom"), a specially built rocket-powered kamikaze aircraft used towards the end of the Second World War. It was the most feared of the kamikazes because there was no defense against it. | Source
The 2,646 pound warhead of the Ohka, Allied soldiers dis-arming one after the war.
The 2,646 pound warhead of the Ohka, Allied soldiers dis-arming one after the war. | Source
Thermojet powered, Model 22 Ohka at the National Air and Space Museum. It would reach speeds of over 600 mph in a dive.
Thermojet powered, Model 22 Ohka at the National Air and Space Museum. It would reach speeds of over 600 mph in a dive. | Source
Another view of the Ohka rocket powered human-guided anti-shipping kamikaze attack plane.
Another view of the Ohka rocket powered human-guided anti-shipping kamikaze attack plane. | Source
A view of the rear of the Ohka. The USS Mannert L. Ablele was the first Allied ship to be sunk by an Ohka aircraft, near Okinawa April 12 1945.
A view of the rear of the Ohka. The USS Mannert L. Ablele was the first Allied ship to be sunk by an Ohka aircraft, near Okinawa April 12 1945. | Source

The Attack on the Shuri Defense Line

In the ten days between May 11th, and 21st, both sides were locked in the fiercest fighting of the Okinawan campaign, so hideously reminiscent of the trench warfare on the "Western Front" during the First World War, both in horrible human losses and the attempt of one side to pierce the defenses of an enemy determined to not yield an inch. The Japanese on Okinawa refused to give up, often leaving the American troops on the island no choice but to use flamethrowers or simply blow the cave entrances with explosives, burying the defenders alive. The Japanese headquarters at Shuri Castle was eventually taken on May 31, 1945. The commander of the Japanese garrison on Okinawa, Ushijima , committed suicide on the 22cnd of June, the same day the island was declared secure by American generals. American forces suffered badly from combat fatigue in the bitter, no-quarter struggle what became known as the "Battle of Okinawa." Few Japanese were prepared to surrender, of the 110,000 man garrison on Okinawa only about 7,000 survived to become prisoners of war.

The Final Bloody Days on Okinawa: The Battle for Shuri Castle

The last picture of U.S. Army Lt. General Simon Bolivar Buckner, Jr. taken on the 8th of June 1945, just 4 days from the final surrender on Okinawa. Later that day he was killed by Japanese artillery.
The last picture of U.S. Army Lt. General Simon Bolivar Buckner, Jr. taken on the 8th of June 1945, just 4 days from the final surrender on Okinawa. Later that day he was killed by Japanese artillery. | Source
A 6th Marine Division demolition crew watches explosive charges detonate and destroy a Japanese cave, May 1945.
A 6th Marine Division demolition crew watches explosive charges detonate and destroy a Japanese cave, May 1945. | Source
Lt. Col. Richard P. Ross commander of the 1st Battalion, 1st Marines braves sniper fire to place the divisions colors on a parapet of Shuri Castle on the 30th of May 1945. The flag was first raised over Cape Gloucester and then Peleliu.
Lt. Col. Richard P. Ross commander of the 1st Battalion, 1st Marines braves sniper fire to place the divisions colors on a parapet of Shuri Castle on the 30th of May 1945. The flag was first raised over Cape Gloucester and then Peleliu. | Source
Shuri Castle before that battle it would anchor the main line of the Japanese defense of Okinawa April 1945.
Shuri Castle before that battle it would anchor the main line of the Japanese defense of Okinawa April 1945. | Source
Stone wall of Shuri Castle.
Stone wall of Shuri Castle. | Source
Dispositions of Shuri Castle.
Dispositions of Shuri Castle. | Source
Shuri Castle was built atop Kakuzu Ridge forming an excellent nature line of defense. The Japanese Army would turn the land in front of Kakuzu Ridge into a killing ground. The bloodiest battle ground of the Pacific War.
Shuri Castle was built atop Kakuzu Ridge forming an excellent nature line of defense. The Japanese Army would turn the land in front of Kakuzu Ridge into a killing ground. The bloodiest battle ground of the Pacific War. | Source
Beneath Shuri Castle was a tunnel complex the left the Japanese soldiers immune from artillery or air attack. They would lay in wait for the artillery to stop and then man their positions.
Beneath Shuri Castle was a tunnel complex the left the Japanese soldiers immune from artillery or air attack. They would lay in wait for the artillery to stop and then man their positions. | Source
American Air and Artillery power would turn Shuri Castle into a ruin.
American Air and Artillery power would turn Shuri Castle into a ruin. | Source

Civilian Deaths

Okinawan civilian deaths in the campaign were in excess of 140,000, it is estimated that more than a third of the surviving civilian population were wounded. Japanese troops treated local civilians brutally using them as slave labor or targets to draw American fire in order to site in their artillery. Some of the civilians were convinced by Japanese propaganda to believe that American soldiers were barbarians who committed horrible atrocities, killed their families, and themselves to avoid capture. It is believed many Okinawan's threw themselves and their family members from cliffs where the Peace Museum now sits. Other Okinawans were murdered by Japanese to prevent their capture or to steal their food and supplies.

Sources

Foster, Simon. Okinawa 1945: Final Assault on the Empire. Arms and Armor Press Willers House, 41-47 Strand, London WC2. Sterling Publishing Co. Inc., 387 Park Avenue South, New York, NY. 10016 1994

Leckie, Robert. Okinawa: The Last Battle of World War II. Viking A division of Penguin USA 375 Hudson Street, New York, NY 10014 USA 1995

Ray, John. The Illustrated History of WWII. Weidenfeld and Nicolson The Orion Publishing Group LTD. Orion House 3 Upper Saint Martin's Lane London WC2H 9EA. 2003

Swanston, Alexander. The Historical Atlas of World War II. Chartwell Books 276 Fifth Avenue Suite 206 New York, New York 10001. USA 2008.

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