"I waited for the 300 metres, but didn't find as much as I thought", Dettori said.
"I think ground had a lot to do with it".
On testing ground, her stride began to shorten in the final furlong on the testing ground and she was unable to resist 16/1 shot who finished fourth in last year's renewal.
Jockey Frankie Dettori said he believed the conditions had stopped her from showing her absolute best.
Ghaiyyath surrendered the lead on the home turn to Magical ($20) but Enable loomed ominously with three-year-olds Sottsass ($7.50) and Japan ($10) making their runs out wider. "He's a fine horse, trained by Andre and owned by a good friend of mine".
He added: "I'm very proud that Waldgeist managed to beat such a fantastic mare, it's well deserved in some ways".
Yearly, almost with out fail, when the experts acquire out their hurry-guidelines in December, the Arc stands by myself as officially the area's top seemingly-optimistic urge and to come to a decision on the following day on its 99th anniversary, Allow will must beat 11 rivals, coming out of stall nine.
"We've always said that Prince Khalid will make the decision, but whatever happened, it wasn't going to be in a hurry and I think we'll get her back and Prince Khalid will want to reflect on all the various possibilities. She's been an unbelievable filly". Prince Khalid has just enjoyed every moment of her.
"We have to accept defeat in racing".
He told Gambling Insider: "Clearly the Enable result was a thing for the industry and was very much needed after a bad Saturday at Ascot when five favorites won in a row".
"We didn't expect any horses to beat Enable, she's so superior but all you can do is try", he told a news conference at Longchamp.
But Waldgeist stayed on past all three to prevail for trainer André Fabre, jockey Pierre-Charles Boudot - and France - with Enable an honourable runner-up.
Billesdon Brook was not quite those odds this time, but still largely unconsidered at 16-1 as she returned to the scene of her greatest triumph.
Having metaphorically shot Bambi earlier in the afternoon, Boudot teamed up with British trainer William Haggas for the second year in succession to win the Prix de La Foret with One Master.
North Yorkshire trainer David O'Meara registered his 1,000th success when Betsey Trotter won at Wolverhampton on Saturday evening.