What was Butler's reaction after Hugo wrote the letter to Captain Butler about the British and French troops' expedition to China?

There is no history of Captain Butler's reaction after receiving Hugo's reply.

Butler was a French captain who invaded China with the British and French allied forces, and participated in the looting of Yuanmingyuan with the Englishman Elgin. Just a French general, and Hugo's friendship is average. He just asked him for a manuscript to improve his reputation.

Because of Hugo's reply, Butler left a mark in history, but other than that, this person's name is unknown and there is no detailed record.