Bertrand Clausel was born on 12 December 1772 at Mirepoix in the County of Foix, and served in the first campaign of the French Revolutionary Wars as one of the volunteers of 1791 In June 1795, having distinguished himself repeatedly in the war on the northern frontier (1792–1793) and the fighting in the eastern Pyrénées (1793–1794), Clausel was made a general of brigade. In this rank he served in Italy in 1798 and 1799, and in the disastrous campaign of the latter year he won great distinction at the battles of the Trebbia and of Novi. In 1802 he served in the expedition to San Domingo. He became a general of division in December 1802, and after his return to France he was in almost continuous military employment there until in 1806 he was sent to the army of Naples. Soon after this Napol