Where do The soldiers chorus and Easter Fair Chorus come from?
It's a bit hard to tell what you mean, exactly. There are a few "soldier's Choruses" in opera. The one you are probably thinking of is from Faust... Faust also has a large fair scene, the Kermess, but the most famous "Easter" chorus is from Cavelleria Rusticana. If your choruses are both in the same opera, I'd bet on Faust for both.