Conversation so far:
Where was Pierre Monteux first a conductor?
At the age of twelve, Pierre Monteux organised and conducted a small orchestra of Conservatoire students to accompany Cortot in performances of concertos in and around Paris.
Where was Pierre Monteux a conductor for the first time?
At the age of twelve, Pierre Monteux organised and conducted a small orchestra of Conservatoire students to accompany Cortot in performances of concertos in and around Paris.
Does your article ever show Pierre Monteux as a conductor?
Yes, there are several photos of Pierre Benjamin Monteux was a French (later American) conductor.
What performance was displayed on the article with Pierre Monteux conducting?
Saint-Saëns at the keyboard, with Pierre Monteux on the rostrum in 1913.
When did the displayed with Pierre Monteux conducting a performance take place?
Saint-Saëns at the keyboard, with Pierre Monteux on the rostrum took place in 1913.
Did Pierre Monteux have any other performances as the conductor?
Pierre Monteux conducted the preliminary rehearsals before Tcherepnin arrived; Stravinsky was so impressed that he insisted that Monteux conduct the premiere.

Question: So he was only a conductor once before the military?
Self-contained rewrite: So Pierre Monteux was only a conductor once before the military?