In 1590, after the Siege of Odawara, when Hideyoshi came to Koga for Oshu Shioki (approach to punish the powerful warriors in the area of Oshu, to prevent them from strengthening their power), Oshima's husband, Korehisa fled, leaving her alone.
天正18年（1590年）、小田原の役の後､奥州仕置に向かった秀吉が古河の方にやって来ると、お嶋の夫の惟久は妻の彼女を置いて逃亡してしまった。