Following the death of his elder brother, on 22 March 1711 he assumed the title Comte de Boufflers and on 28 March 1711 he was made colonel of his late brother's infantry regiment, despite being only five years old.[3] On 22 August 1711, Joseph Marie inherited his father's title and estates.[4] He also assumed his father's positions as governor of Flanders and Hainut, Lille, and Beauvais.[1]
Military career
On 1 December 1720 he was made colonel of the Régiment de Beaufort, which from May 1721 was renamed Régiment de Boufflers. On 1 July, Joseph Marie received the Régiment de Bourbonnais, for which he gave up the regiment of his name.[1]
On 1 January 1743 Joseph Marie was made a knight of the Order of the Holy Spirit; he was later painted by Jean-Marc Nattier wearing the sash of the order. On 1 May 1743 he was assigned to the Army of the Rhine under Marshal Noailles and was wounded on 27 June 1743 at the Battle of Dettingen. In 1744 he was appointed a lieutenant general in the French Royal Army, in which capacity he took part in the siege of Veurne.[3][5] Later that year he accompanied the king to Alsace and during his stay in Metz as his aide-de-camp.[3] He remained in the role during the siege of Tournai and the subsequent Battle of Fontenoy in May 1745. In 1746 he was again employed in the Army of Flanders as the king's aide-de-camp. He received a separate command and served under Louis François, Prince of Conti at the siege of Mons from 1 June 1746, after which he returned to the king. He later fought at the Battle of Rocoux in October 1746.[3]
Joseph Marie was assigned to the Italian Army as commander of the French troops in the Republic of Genoa in their fight against the Kingdom of Sardinia. He reached the city on 1 May 1747, but died of smallpox on 2 July.[3] He was buried in Genoa.[1]
In the second half of the 1730s – and probably until the duke's death in 1747 –, the Duke and the Duchesse of Boufflers rented the Hôtel Chanac de Pompadour and made it their residence in Paris. Depending on the source, the Duchess may have purchased the property after her husband's death in 1747.[7][8]
