collapse

Wiped out the forces of Choshu from political arena of Kyoto. (Boss of conspiracy)
The collapse of the coup regime of Tosa. (Boss of assassination)
kyoto's security was restored because they was expelled.
It was not.

They had come back to Kyoto secretly with cornered mentally.

"Set fire to various area of Kyoto.
Kill the responsible to guard  for Kyoto. (for example，Katamori of Aizu lord)
And take away the emperor.”

Such a plan had been set up.
This plan had participated many important figure of their group，
But this plan was detected beforehand by Shinsengumi，and most of the participants were killed.

Well，kyoto's security was restored by this.
It was not.

Choshu samurai did rage to hear this，immediately went to Kyoto in droves  as Choshu army.
They were stationed on the outskirts of Kyoto and demanded the lifting of sanctions imposed on them.
It was of course ignored.
They started marching aiming to Imperial Palace，battle began.

Eventually they destroyed by Satsuma and Aizu.
Most of the major figures of their group died by this battle.　
　
After this，Choshu became "Enemy of the Emperor".
(Because attack the Imperial Palace and they gave a severe damage to the Kyoto.)
Tokugawa decided to dispatch subjugation military to Choshu.　

・・・・・・・・・

And immediately after this， the West Fleet had attacked to territory of Choshu.
They was landed Naval brigade after a naval bombardment，and did occupied military bases of Choshu.

Of course，this was retaliation for Choshu's shelling of sudden.
Above all，Attack to Western people at that time was frequently.
Nobody was able to deny the involvement of Choshu.