In October 1550 Shingen began the Sieges of Toishi Castle, from which position he intended to carry out the final attack on the main Murakami castle of Katsurao.
Pada bulan Oktober 1550 Shingen memulai Pengepungan Puri Toishi, dari posisi mana ia bermaksud melakukan serangan terakhir terhadap puri Murakami utama di Katsurao.