 Nyorai mberi kweiyi ndima - Chinetso chokutanga icho Katamori akatarisana nacho pashure pokutora nzvimbo chaiva kusaziva kwavagari vomunzvimbomo pamusoro peAizu uye mano ayo okuita basa racho. Aizu yakanga isingazivikanwi kuvanhu vakawanda mukuvamba kwa1863 zvokuti vazhinji vavo vakataura zita rayo kaizu kana kuti kwaiz, zvose zviri zviviri ai uye kai kuva kurava kwakajairika kwechiratidzo chokutanga muAizu. Iyi nhau yokusaziva uye kusagadzikana yakavamba kuva negadziriro mumwedzi yapakuvamba ya1863, apo Katamori akagamuchirwa pamutemo padare raMambo. Vakuru vakuru vedare vakafara zvikuru kuona kusvika kwake, uye vakava netariro huru maari somumiriri we Kōbu gattai kufamba kukurudzira kushandira pamwe patsva pakati peDare neShogunate. Kuti aite zvinangwa zvaiva nechokuita neShugoshoku, Katamori akashandisa mapurisa eguta, mamwe acho aiva nevashandi vake, asi mamwe aiva nevarume vaibhadharwa, vaimbova vasina vanatenzi, vakadai seShinsengumi. Mamwe mapoka akabuda mumakore akatevera, kusanganisira Mimawarigumi, iyo yaive pasi pekutonga kwe Shoshidai iyo kubvira muna 1864 yaive hama yaKatamori Matsudaira Sadaaki weKuwana. Katamori akatora basa rake semudziviriri weKyoto uye Dare zvakanyanya, uye nekudaro akaita basa rakakura mukubvuta hurumende kwaGunyana 30 kana kubvuta hurumende kwaNyamavhuvhu 18, uye chiitiko cheKinmon , izvo zvese zvaibatanidza kurwisana pakati pemapoka akabatana pasi peShogunate kusanganisira Aizu vachipesana nevarume veChōshū Domain. Mukati mokuranga Kwokutanga neChipiri Chōshū nzendo, iye akatsigirawo nzira yakaoma mukurwisana nehurumende. Zviitiko izvi zvinotungamira mukuwedzera ruvengo kurwisa Katamori neAizu Domain mukati meChōshū Domain. 