The Kyà «shà « campaign of 1586–1587 was part of the campaigns of Toyotomi Hideyoshi who sought to dominate Japan at the end of the Sengoku period. Having subjugated much of Honshà « and Shikoku, Hideyoshi turned his attention to the southernmost of the main Japanese islands, Kyà «shà «.
Battles had raged for the previous few years between the daimyà  of Kyà «shà «, and by 1585 the Shimazu family of Satsuma were the primary power on the island.
In 1586, Shimazu clan heard of Hideyoshi's plans for invasion, and lifted their siege of Tachibana castle, withdrawing a great portion of their forces back to Higo province, while the rest stayed in Bungo province. There, they seized Funai Castle from the à Âtomo clan and prepared for the invasion.
The à Âtomo were supported by armies under Sengoku Hidehisa, Sogà  Masayasu, and Chà Âsokabe Motochika a major Shikoku lord who had been defeated by Hideyoshi the previous year, and had thus joined him. Though Bungo province ultimately fell to the Shimazu, Sengoku and Chà Âsokabe delayed them and weakened them in preparation for the arrival of Hideyoshi's armies and those of the Mà Âri clan under Kobayakawa Takakage, another ally of Hideyoshi.
Hashiba Hidenaga, half-brother to Hideyoshi, landed to the south of Bungo, attacking the Shimazu at , on Kyà «shà «'s eastern coast, in 1587. Meanwhile, Hideyoshi took his own forces down a more westerly route, attacking in Chikuzen province, which was held by the Akizuki clan. Later that year, the two brothers would meet up in the Shimazu's home province of Satsuma, to assault their home castle at Kagoshima. Ultimately, Kagoshima itself was not attacked; the Shimazu surrendered, leaving Hideyoshi to return his attention to the Hà Âjà  clan of the Kantà Â, the last major clan to oppose him.
Hideyoshi would make use of Kyà «shà « through much of the 1590s in his attacks on Korea.