It is a wonderful and fun piece of music. The first part has several high b's and c's after setting for long rests. Depending on the size of you group you might consider using these parts. Instead of being three tunpets in c, the third trumpet plays picc. You might also try D trumpet for the first part.
http://la.trompette.free.fr/parts/do...r=poulenc3.pdf http://la.trompette.free.fr/parts/poulenc1modif.pdf