The non-works Peugeot Oreca was fourth after the French manufacturer, who ended Audi's five-year reign last year, saw their three works cars retire with mechanical failures.Peugeot had looked race favorites after sweeping the front two rows of the grid in qualifying and then initially holding their positions at the start of the race.The French team suffered a setback after three hours when their pace-setting car, which locally-born ex-Formula One driver Sebastien Bourdais had put on pole, withdrew due to suspension failure.At daybreak, Peugeot were still in the lead with Frenchman Franck Montagny enjoying a two-lap lead over the first Audi when engine failure forced him to stop on the track side and walk away from his car.Audi, who had since 2000 won eight editions of the world's oldest sportscar race which started in 1923, were meanwhile playing the long game and survived all the race incidents.In front of more than 200,000 people, the shock of the race came 20 minutes after the 55 cars had left the grid when former Formula One world champion Nigel Mansell crashed at the entrance of the famous 6.2 km Mulsanne straight.The 56-year-old Briton, competing in a Ginetta Zytek with his sons Greg and Leo, spun and hit the guardrail. He was taken to hospital for checks but escaped without serious injuries.