On July 27th of the year of Mizunoe-Saru (one of the Oriental Zodiac signs), Prince Oama who had retreated to Yoshinomiya Imperial House, decided to declare war against the Imperial Court of Omi and departed for Togoku where his troops had gathered.
壬申の年の6月24日、吉野宮に隠棲していた大海人皇子は、近江の朝廷に対する戦いを決意し、兵を集めさせた東国に向かって出発した。