He was called "Hitokiri Kuwajiro" because he involved many battles of the Shinsengumi. In March 1868, Oishi ran away from the Shinsengumi and tried to join Satsuma han troops. But he was captured and execused on the charge of murder of Ito Kashitaro.
References
- Shinsengumi Zentaishi Tettei Guide (新選組全隊士徹底ガイド) Maeda Masaki
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