Siege of Koriyama

Siege of Koriyama
Part of the Sengoku period
Date September 1540 to January 1541 Location Yoshida, Aki Province, Japan Result Mōri victory
Belligerents
Amako clan	forces of Mōri Motonari
Commanders and leaders
Amako Haruhisa Amako Hisayuki† Kamei Hidetsuna Kikkawa Okitsune Kokushou Hisazumi Misawa Tameyuki† Takahashi Mototsuna† Takao Hisatomo Yonehara Tsunahiro Yubara Munetsuna†	Mōri Motonari Awaya Motoyoshi Awaya Motozane Katsura Motozumi Kodama Narimitsu Kunishi Motosuke Watanabe Kayou Relief forces: Sue Harukata
Strength
30,000	8,000 10,000 Ōuchi relief force

Siege of Koriyama (吉田郡山城の戦い, Yoshida Kōriyama no tatakai^?) took place from September, 1540 until January, 1541 in Yoshida, Aki Province, Japan during the Sengoku period. Amago Haruhisa, with 30,000 men, attacked Kōriyama Castle, which belonged to Mōri Motonari and was defended by 8,000 men. When the Ōuchi clan sent an army under the command of Sue Harukata to relieve the siege, the Amako were forced to leave.

By the end of the 1530s, Mōri Motonari had cut ties with the Amako clan (also known as Amago) and realigned himself with the Ōuchi. Taking advantage of the growing weakness of the Takeda clan of Aki, Motonari grew ever more powerful in Aki province. By 1540, the old lord of the Amako, Tsunehisa had nominally retired and turned over the leadership of the clan to his grandson, Haruhisa (also known as Akihisa.)

In that year Amago Haruhisa conceived of a plan to destroy Mōri Motonari and bring Aki province under the sway of the Amago. When a council of the Amako retainers was called to discuss the planned campaign, almost all spoke in favor of the attack. Amago Hisayuki, however, considered the risks to be too great and spoke out against it, but was derided by Tsunehisa as a coward and publicly humiliated. Hisayuki was given the task of engaging the Mōri's ally, the Shishido clan in Aki as part of an initial and concurrent operation of the larger Amago campaign into Aki.

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