In 1399, the year after taking power, Mitsukane dispatched his sons Mitsunao and Mitsusada to Mutsu Province's Sasagawa Gosho and Inamura Gosho to stabilize the situation in the region which, together with Dewa province, his father had received in 1392 from shogun Ashikaga Yoshimochi as a reward for his support against the Yamana clan. This because he realized the importance of the area to control the whole Kantō province. In August of the same year he stayed himself in Southern Mutsu, returning to Kamakura only four months later. This increased immensely the support given by the Yūki Shirakawa family to his brothers, and therefore to himself.