"We knew how hard it was going to be coming away to France. Any game over here is tough, especially in a cauldron like this. We knew it would take something special to get a win and as happened it was a special performance from a team that wasn't playing particularly well," said O'Mahony.
"But the sign of a good team and a team that is progressing is to get a win like that out in France. It is certainly going to be up there in my books.
"We wanted to win more than anything. We expected a fight and we got it alright - it was bruising and there will be plenty of sore bodies tomorrow.
"We spoke about that and we said it would pay off. We said that if we went to a dark place, and we hurt ourselves, we were going to be in a good place. And that's where we are - we are in a good place.
"We have some great game breakers and with a team like this you can never give up. We trusted our scrum. We know it is good. We had to show some bottle there and credit to the front row, the front five and the whole pack or that penalty try.
"We have two games to go but this has put us in a good position. We will enjoy this over Christmas!"