He served King
Louis XIII in all his wars, both in
Languedoc and in
Piedmont,
Flanders and
Lorraine. He made his debut at the Siege of Caen, served as a volunteer during the
Huguenot rebellions in the
Battle of Ponts-de-Cé, and at the
Sieges of Saint-Jean-d'Angély, Clairac,
Montauban,
Montpellier and
La Rochelle, all in 1621. He crossed into Piedmont in 1629, took part in the Battle of Pas-de-Suze, and went to the aid of Casale with his regiment. He then served in Lorraine. He was found at the Siege of Trier, at the Battle of Yvoy, and at the Siege of Saverne, where he was wounded. He forced General de Mercy to lift the Siege of Héricourt and had his knee shattered at the Siege of Saint-Hippolyte. He was wounded again at the battle of Rey against Baron de Sécy. In 1636, the King gave him the Government of
Montbéliard and, in 1644, that of
Gravelines after the
Siege of Gravelines. He became Lieutenant-general in 1644, he received the baton of
Marshal of France in January 1651. In 1650, at the height of the troubles of
the Fronde, Mazarin announced a promotion of marshals, and let the names of four Lieutenant-generals circulate in advance for whom he intended this honor. Grancey, who had real titles, was not one of them. He then left
Paris with a lot of noise to retire to his government, saying aloud that the Spanish would be very happy to have Gravelines back. In this time of disorder, such a thing was possible; the Cardinal was afraid and sent the baton to Grancey. The Spanish were indeed very attached to Gravelines. They made enormous sacrifices, in 1652, to put it back in their power. Grancey's regiment defended the place well and only surrendered it on honorable terms. He returned to Piedmont where he defeated the Spanish at the Battle of La Roquette and then gave up attacking the
Waldensians, following the intercession of Pastor with Captain Laurent de l'Aube de Corcelles, which forced the
Marquess of Pianezza to initiate repression himself in 1655, the Waldensian Easter. The King made him a Knight of the
Order of the Holy Spirit and named him Governor of
Thionville on 1 January 1662. ==Personal life==