Conversation so far:
What did Phillip Sheridan do postbellum?
Philip Sheridan was promoted to lieutenant general
what did Phillip Sheridan do after becoming lieutenant general?
Philip Sheridan was sent observe and report on the Franco-Prussian War
what else was Philip Sheridan was doing in the time when he was sent observe and report on the Franco-Prussian War?
Philip Sheridan was present when Emperor Napoléon III surrendered to the Germans

Question: what happened in the franco prussian war
Self-contained rewrite: what happened in the franco prussian war where Philip Sheridan was present when Emperor Napoléon III surrendered to the Germans?