Which French marshal defected to the Allies in 1814 during the campaign in France?

Auguste de Marmont was the French marshal who went over to the Allied side during the 1814 campaign in France. As Napoleon’s military position deteriorated, Marmont commanded forces defending Paris and concluded that continuing the war was futile.

After the Battle of Paris on 30 March 1814, Marmont and Marshal Mortier negotiated with the Allied commanders. Marmont then made a secret arrangement allowing his corps to pass through Allied lines and surrender. His decision helped make the fall of Paris unavoidable and contributed to Napoleon’s abdication in April.

Marmont’s action is often described as a defection, although the immediate episode involved negotiating a capitulation and transferring his troops rather than simply abandoning his post alone. He later accepted service under the restored Bourbon monarchy. Bonapartists consequently branded him a traitor, and the phrase “Raguse” became associated with betrayal in nineteenth-century French political language. The other listed marshals do not fit this specific 1814 episode.