In the August of 1416, during the riot of Zenshu UESUGI, he took part in expelling the Kamakura kubo, Mochiuji ASHIKAGA, together with his sons, Kenetane CHIBA and Yasutane MAKUWARI (According to the record of "Kamakura Ozoshi", he had 8000 horsemen, when the ringleader Ujinori UESUGI and Mitsutaka ASHIKAGA's military force were 2000 and 1000 horsemen each).
1416年8月、上杉禅秀の乱に際しては、子の千葉兼胤・馬加康胤らとともに上杉禅秀（禅秀）に与して鎌倉公方・足利持氏追放に加担した（『鎌倉大草紙』の記録を信じれば、首謀者とされる上杉氏憲・足利満隆の兵力がそれぞれ2千騎・1千騎であったのに対して8千騎を動員したという）。