He served in Flanders in 1701 and in the Netherlands in 1702 during the War of the Spanish Succession.
Boufflers led his regiment in the Siege of Lille in 1708, being wounded in a sortie in October.
[1] From January 1710, Boufflers commanded the Régiment de Barrois (and gave up the regiment of his name) under Marshal Berwick.
From 14 November 1713 he commanded the 11e Régiment d'infanterie de France (and gave up the Régiment de Barrois in return), with which he took part in the siege of Freiburg im Breisgau.
[1] On 8 March 1718, Boufflers was made maréchal de camp and on 23 December 1731 he was appointed lieutenant-général des Armées du Roi, but by this stage was no longer in regular army service.