A cavalry officer of a noble family of magistrates who had reached maréchal de camp before the Revolution, Canclaux commanded the Army of the Coasts of Brest from May 1793 and held Nantes against the assault of the Catholic and Royal Army on 29 June, in which Cathelineau was mortally wounded.
His plan for a concentric advance from Nantes was preferred to Ronsin’s at the conferences of that summer, which made him the target of the war office group around Bouchotte and Rossignol; he was suspended at the end of September and replaced by Rossignol.
Recalled after Thermidor to command the Army of the West, he provided the military framework for the pacification negotiated at La Jaunaye in February 1795 and supported Hoche at Quiberon. He was afterwards ambassador at Naples and a senator.