Battle of Kōriyama

The Kōriyama Campaign (郡山合戦, Kōriyama Gassen) was a series of battles between February and July in 1588 between the Date clan and combined forces from the Ashina and Sōma clans over the areas around Kōriyama Castle and Kubota Castle in Adachi and Asaka Districts in Mutsu Province during the Ashikaga shogunate in Japan. Some accounts indicate it began following the invasion of territory belonging to the Tamura clan in April 1588 after turmoil caused by the death of Tamura Kiyoaki in 1586.

The conflicts were settled in July 1588, with the Date clan having an effective victory.