Former England flanker Andy Hazell was sent off as Gloucester launched their Amlin Challenge Cup campaign with an 11-6 victory in an ill-tempered clash at Stade Guy Boniface.
Hazell received a red card midway through the second period after he aimed a flurry of punches at an opponent on the floor and used his knee. Hazell's back-row colleague Matt Cox was sin-binned for an off-the-ball challenge in the same incident that meant Gloucester were temporarily reduced to 13 men.
But the Aviva Premiership club prevailed thanks to Ian Clark's 30th-minute try, while Tim Taylor and Billy Twelvetrees booted second-half penalties. Full-back Jean Baptiste Claverie kicked two penalties for the home side, yet Gloucester deserved their Pool One triumph that sets them up for next Thursday's Kingsholm appointment with Bordeaux-Begles.