When Toshizo HIJIKATA was killed on May 11, 1869 and Saemon KASUGA was killed on May 12, he was recommended to escape from goryokaku (the main fortress of the short-lived Republic of Ezo) by the president, Takeaki ENOMOTO and the head of the military police, Keisuke OTORI.
明治2年(1869年)5月11日に土方歳三が、12日に春日左衛門が戦死すると、総裁榎本武揚や陸軍奉行大鳥圭介らに本営五稜郭からの脱出を勧められる。