In Osaka no Eki, because of the splendid performance by Nobushige SANADA, etc., Morichika could have no part to play (there is a view that guard of the Sanadamaru was conducted by Nobushige SANADA and Morichika jointly), but, in Osaka no Eki, he led the main-force units of twenty thousand together with Shigenari KIMURA, who was a key vassal of the Toyotomi family, and fought with Takatora TODO of the Tokugawa family.
大坂の役では真田信繁などの活躍で盛親に出番はなかったが(真田丸の守備は真田信繁と盛親が共同で行っていたという説もある)、大坂の役では豊臣家重臣の木村重成らとともに2万の主力軍勢で徳川家の藤堂高虎と戦った。