Battle of Iwaya Castle

The Battle of Iwaya Castle, fought in the seventh month of Tenshō 14 (1586) at Iwaya Castle in Chikuzen (present-day Dazaifu, Fukuoka), was the clash between the Shimazu clan—on the verge of unifying Kyushu—and the Ōtomo retainer Takahashi Jōun, and it is famed as one of the Sengoku era's most heroic last stands.

Since crushing Ōtomo Sōrin at the Battle of Mimigawa in 1578, the Shimazu of Satsuma had swept across Kyushu. Almost the only holdouts for the Ōtomo in northern Kyushu were Takahashi Jōun, who held the Hōman and Iwaya castles, and his eldest son Tachibana Muneshige at Tachibana Castle. In 1586 a Shimazu army said to number 50,000 advanced into Chikuzen, taking Ōtomo strongholds one after another. In its path stood Iwaya Castle, held by Jōun with only 763 men.

Rejecting advice to withdraw to the stronger Hōman Castle, Jōun deliberately chose to defend the tactically weak Iwaya, serving as a shield so the Shimazu could not bypass it to strike Tachibana Castle and Hōman Castle, where his wife, second son, and non-combatants had taken refuge. When the Shimazu demanded surrender on the 12th, Jōun refused. The assault began on the 14th, and for nearly half a month the tiny garrison fought a savage hand-to-hand defense against 50,000, inflicting heavy losses before falling one by one. On the 27th, the fourteenth day, Jōun and every last defender died.

After the castle's fall, the Shimazu commanders inspecting Jōun's head are said to have left their seats, sat on the ground, and wept, calling him a rare and matchless general. His stand cost the Shimazu heavy losses and precious time—time in which Toyotomi Hideyoshi's Kyushu expedition advanced, forcing the Shimazu to retreat and ending their bid to unify the island. Jōun's son Tachibana Muneshige carried on his legacy, becoming one of the most celebrated generals of the age.