Claparède enlisted in a battalion of volunteers in 1792. Having been promoted to captain he served under Napoleon Bonaparte in Italy. Having given command of a battalion in the Army of the Rhine, Claparède served at Hohenlinden. He took part in Charles Leclerc’s failed expedition to Santo Domingo. Having been promoted to general de brigade he returned to France in 1804, where he joined the Grande Armée at Boulogne.