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Brandao grew increasingly influential for the hosts and picked out Corgnet with a headed pass, but the midfielder's effort was kept out by the goalkeeper.
Brandao had a go of his own midway through the half, but his left-footed shot across the box was somehow kept out of the bottom corner.
Etienne grabbed the lead just before the break when Renaud Cohade gambled with a run to get onto the end of Corgnet's corner, before guiding the ball home with his left foot.
The hosts doubled their advantage in the 56th minute when Corgnet drilled home an effort from outside of the box into the bottom corner.