He married Louise-Julienne des Nos de Champmeslin in Brest, Finistère, on 30 November 1708.

He fought in the Battle of Vélez-Malaga on 24 August 1704, then commanded the company of Gardes de la Marine in Brest.

In December 1705, he commanded a squadron charged with attacking the English possession in the Antilles.

He caused great damage to the English colonies of Saint Kitts and Nevis in February 1706.

[1] Chavagnac spent a week in Saint Kitts, where he caused great damage and looted much property, including 300 slaves.