Favored Zipping fell, dropping jockey Davy Bonilla at the halfway stage, but the colt returned to his stable. He ruptured a blood vessel and collapsed, but the result was not as bad as initially feared.
Soumillon was last in the 12-horse field with 16-1 Porlezza. He switched her out with more than a furlong to go and she quickly made headway.
Yves de Nicolay became the first Deauville-based trainer to win a group I event."We changed tactics today with Porlezza and decided to drop her out," he told The Racing Post.. "Her next target isthe Abbaye de Longchamp and there has been the possibility that the filly will be sold over the past 48 hours."
Well-backed Nayyir got off slowly and was a disappointing seventh for Eddie Ahern.
Bonilla was badly shaken by Zipping's fall but was able to ride in the following race.
Earlier on the Deauville card, Ecurie Wildenstein's Vallee Enchantee stormed past leading Treble Heights halfway up the stretch to win the Prix de Pomone (Fr-II) at 13 furlongs and 110 yards easily by six lengths.
Frankie Dettori, aboard Treble Heights, had things his way, but was unable to match Vallee Enchantee and Dominique Boeuf when they drew up alongside in the test for fillies and mares. Mandela was third, 1 1/2 lengths farther behind. Vallee Enchantee is an Irish-bred 3-year-old by Peinte Celebre traind by Elie Lellouche.