Okinawa

About 600 kilometers south of Japan in The East China Sea lies Okinawa. Okinawa is the largest of the Okinawa islands in the the Ryukyu archipelago. Japan annexed the archipelago in 1879, which until then was an independent kingdom living on trade with Japan, China, Formosa (Taiwan) and the Philippines. The Ryukyuan people had their own culture, religion and language, which was strongly disliked by Japan, which introduced Japanese culture, nationalism and language. Ryukyuan people were also seen as inferior than the Japanese. Islands such as Okinawa with its military strategic location came during the thirty and forties to be strengthened militarily several air bases.

In 1941, Japan attacked the US Navy base at Pearl Harbor, Hawaii, trying ro inflict sa much damages as possible to the US Navy Pacific fleet. The attack was partly a success, but large parts of the fleet were out at sea and escaped. Initially, Japan enjoyed great success in the Pacific and occupied a number of islands and island groups. A turning point in the Pacific war was the battle of Midway in June 1942 where Japanese and American naval and airborne forces clashed. During the battle, Japan suffered heavy losses and lost four aircraft carriers (Kaga, Soryu, Akagi and Hiryu), while the US lost only one aircraft carrier (Yorktown). Japan also lost about 300 planes while the United States lost about 150 planes, which turned the tide in the Pacific in favor of the US. In February 1943, Guadalcanal (part of the Solomon Islands) was recaptured, in November 1943 the Gilbert islands were recaptured, in the spring of 1944 the Marshall Islands, in the summer of 1944 Northern Mariana Islands, in autumn 1944 Palau (Peleliu) and in March 1945 Iwo Jima was taken.

At the same time as the battle for Iwo Jima raised, a amphibious landing operation was being prepared for Okinawa. The planning had already begun in the autumn of 1944, by then Formosa (now Taiwan) was also discussed as an alternative. Okinawa had several air bases and its proximity to the Japanese mainland made the island suitable as a springboard. For the operation the 10. army was created consisting of about 180,000 men from the marine corps and the army under the command of Lieutenant General Simon Bolivar Buckner Jr. The naval forces (fifth fleet) consisted of about 1500 various ships under the command of Admiral Raymond A. Spruance. The Naval forces also consisted smaller number from the UK, Canada, New Zealand and Australia. The Japanese defense on Okinawa consisted of about 70,000 men from the 32. army under the command of general Mitsuru Ushijima. Japan had also forcibly recruited some 39,000 Ryukyuan people under the command of the army. About 9000 sailors (with insufficient combat training) were also recruited for the defense under the command of vice admiral Minoru Ota.

The invasion off Okinawa was codenamed, ICEBERG, and started on March 26 when the American 77. infantry division landed on an archipelago called Kerama about 25 kilometers southwest of Okinawa. The Japanese defense was weak and the  islands could be conquered in three days. The purpose was to have Kerama as a naval depot and a safe harbor protected from Japanese artillery on Okinawa. Three smaller islands, Keise Shima, about eight kilometers from Naha (Okinawa’s capital) were also conquered. At Keise Shima, the Americans set up artillery to support the coming invasion on the main island (Okinawa). A few days before the landing, naval and aircraft carriers launched massive bombardment and airstrikes against Japanese defences on Okinawa. The aim was to inflict as much damage as possible to the Japanese defence prior the landing.

On April 1, about 60,000 American troops landed on a 15-kilometer stretch of beach (Hagushi) on the west side of the island. Surprisingly, the Americans met only sporadic resistance and were able to take the Kadena and Yomitan airbases with relatively small losses on the first day. Something that was planned to be achieved in the following days. The Americans then divided into a northern and southern advance. The advance north proceeded without any major problems and the northern part of Okinawa was conquered by 6. marine division in about 14 days without significant losses. The fiercest battles were fought on an island called Ie Shima just outside the Motobu Peninsula. Ie Shima had airbases and radar stations that the Americans wanted to conquer and therefore landed 77. infantry division on Ie Shima on April 16. The Japanese fought furiously, but after four days of fierce fighting, the island was in American hands.

The advance south went smoothly the first few days but then all hell broke loose. The Japanese commander had deliberately held back the forces during the landing. Something that to some extent puzzled the Americans when they had expected hard resistance. Ushijima understood that Okinawa was lost, but he intended to let the Americans pay a high price. It was also important to gain time to build up the defence on the mainland ahead of a coming invasion. In Okinawa, the Japanese had in 1944 began building extensive tunnel systems and strong defensive positions on number of ridges and hills along the American advance. Defence lines were constructed in such a way that when one line fell, it was immediately replaced by another. The Japanese therefore fought hard and inflicted the 96. 7. and 27. infantry divisions noticeable losses in both soldiers and materials (27. and 96. were lster replaced by 1. marine division and 77. infantry division). American tanks became easy targets for Japanese anti-tank guns in the narrow passages surrounding the ridges and hills. Fierce battles were fought at Pinnacle, Cactus Ridge, Kakazu Ridge, Hacksaw Ridge, Big Apple Ridge, Kanushi Ridge, Dakeshi Ridge, Connical Hill, Sugar Loaf Hill, Horseshoe Hill, Half Moon Hill and Shuri Castle.

Americans were also about to learn (if they didn’t already know from previous campaigns) that the Japanese fought furiously and largely refused to surrender. They remained hidden in caves and tunnels and carried out suicide attacks when nothing but capitulation remained. The Americans therefore used flamethrowers and phosphorous- and hand grenades to subdue the Japanese who hid in caves and tunnels and refused to come out. In these cases, it was not only Japanese soldiers who were killed but also civilians who sought refuge in caves, either voluntarily or brought there by force. The Japanese often forced civilians out of the caves to obtain supplies. A large proportion of the civilians who died on Okinawa were killed in the line of fire. It also happened that doctors, nurses and wounded soldiers were killed because some caves served as field hospitals.

Japanese defence tactics had effectively slowed down the American offensive in the south. But there were still different views about how the island could be defended in the best way. Ushijima’s chief of staff, lieutenant general Isamu Cho, advocated an aggressive strategy to attack the Americans with massive frontal attacks. Something that he also considered would be good for combat morale. Ushijima’s military adviser, Colonel Hiromichi Yahara, instead advocated the defensive strategy applied so far rather than seemingly pointless suicide attacks. Ushijima was nevertheless persuaded of a counteroffensive and on May 4 the Japanese attacked American defenses north of the Shuri line. But the attack was ill-prepared, ill-coordinated and had no air support. The Americans could therefore fight back the attack with relative ease. At the same time, the Japanese tried to attack the americans from the sea by landing on respective flanks and attacking the americans in the back. But this failed completely when both boats and men were sunk before they reached land. About 3,000 Japanese died in this offensive and they returned to Yahara’s defensive strategy for the rest of the battle.