Invasion of Ryukyu
Invasion of Ryukyu
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Invasion of Ryukyu

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Invasion of Ryukyu

The invasion of Ryukyu (琉球侵攻, Ryūkyū Shinkō) by forces of the Japanese feudal domain of Satsuma took place from March to May of 1609, and marked the beginning of the Ryukyu Kingdom's status as a vassal state under the Satsuma domain. The invasion force was met with stiff resistance from the Ryukyuan military on all but one island during the campaign. Ryukyu would remain a vassal state under Satsuma, alongside its already long-established tributary relationship with China, until it was formally annexed by Japan in 1879 as the Okinawa Prefecture.

The war was called the Disturbance of Kiyū (己酉ノ乱, Kiyū no ran), with 1609 being a kiyū year in the sexagenary cycle. It was also called the Japanese Disturbance of Kiyū (己酉倭乱, Kiyū Wa ran) by the Ryukyu Kingdom. In Japan, the war was called the Ryukyu Expansion (琉球征伐, Ryūkyū Seibatsu) or the Entry into Ryukyu (琉球入り, Ryūkyū iri) during the Edo period, and was called the Campaign for the Chastisement of [Oki]nawa (征縄の役, Sei Nawa no Eki) by many Japanese scholars before WWII.[failed verification]

Satsuma's invasion of Ryukyu was the climax of a long tradition of relations between the kingdom and the Shimazu clan of Satsuma. The two regions had been engaged in trade for at least several centuries and possibly for far longer than that; in addition, Ryukyu at times had paid tribute to the Ashikaga shogunate (1336–1573) of Japan as it did to China since 1372.

In the final decades of the 16th century, the Shimazu clan, along with Toyotomi Hideyoshi, who ruled Japan from 1582 to 1598, requested or demanded various types of aid or service from the kingdom on a number of occasions. King Shō Nei (r. 1587–1620) met some of these demands. Shō Nei sent a tribute ship, the Aya-Bune, to Satsuma in February or March of 1592, and agreed to provide approximately half of his allocated burden in preparation for the invasion of Korea in 1593. However, Shō Nei also ignored many communications from Shimazu and Hideyoshi, which spurred the Shimazu, with the permission of the newly established Tokugawa shogunate (1603–1867), to invade Ryukyu in 1609, claiming it to be a punitive mission.

One of the chief events which spurred Satsuma to aggression occurred when Hideyoshi launched the first of two invasions of Korea. In 1591, Shimazu Yoshihisa said that "Hideyoshi ordered Ryukyu and Satsuma to contribute 15,000 troops in order to invade China; however, Ryukyu is a far country and Japanese military strategy is unfamiliar to your forces. I exempt you from mobilization of the troops. In exchange, however, you must supply 10 months' rations for 7,000 troops." Sho Nei supplied only half of the demanded amount in 1593.

Following Hideyoshi's death in 1598, and Tokugawa Ieyasu's subsequent rise to power, Shō Nei was asked by Satsuma to formally submit to the new shogunate, a request which was ignored. In 1603, some Ryukyu sailors were cast ashore on the coast of the Sendai domain, and Tokugawa Ieyasu sent them back to Ryukyu. The Shimazu asked Ryukyu to thank Ieyasu again, but Ryukyu ignored the request. The Shimazu then requested to launch a punitive mission against Ryukyu. Approximately 100 ships carrying roughly 3,000 soldiers concentrated at Yamakawa harbor on March 1, 1609. Ichirai Magobee, who was one of them, would write a diary documenting the expedition. The fleet left harbor on March 4, under the command of Kabayama Hisataka and Hirata Masumune.

The Satsuma fleet arrived at Amami Ōshima on April 7, where the Amamian people did not resist, but assisted the Satsuma army. Tameten (笠利首里大屋子為転), the chief of Kasari, was a subject of Kabayama, and called on the Amamian people to surrender. Shigetedaru (焼内首里大屋子茂手樽), the chief of Yakiuchi, supplied the Satsuma army. On April 10, Shō Nei was informed of Satsuma's landing on Amami, and he sent Ibun (天龍寺以文長老), the priest of Tenryu temple, to Amami in order to surrender, but Ibun missed the Satsuma army for unknown reasons. On April 16, 13 Satsuma ships then left for Tokunoshima in advance, and the others left Amami at 6 am on April 20.

On April 17, 13 ships arrived at Tokunoshima and dispersed. Two ships arrived at Kanaguma, but nothing happened. Eight ships arrived at Wanya. The ships were besieged all night by 1,000 people. On April 18, Satsuma troops disembarked, fired into the crowds, and killed 50 people. Three ships arrived at Akitoku, and were attacked at the water's edge by the Akitoku people. However, troops quickly fought back and killed 20–30 people. The Satsuma fleet also arrived at Akitoku at 4pm, April 20. On April 21, Kabayama left for Okierabu Island with 10 ships in advance. Others left Tokunoshima at 10am, April 24, and arrived at Okierabu at sunset. They met Kabayama and his ships there, and quickly departed for Okinawa Island.

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