 Ernest Henry left Peugeot in February 1915, replaced by the engineer Marcel Grémillon who developed a 1-liter, five valve per cylinder, triple overhead cam engine in 1920-1921.Looking back at Henry's time at Peugeot, a writer in 1921 said his cars "won practically all races in which they were entered".At the end of the World War I in December 1918, the driver René Thomas and Ernest Henry offered to Ernest Maurice Ballot the design of a race car that Ernest Henry had made during the war.