He was injured by a musket shot on 15 October 1715, at the siége of Fribourg.
[4] Montmorency was involved in the Cellamare conspiracy, the plot against the Regent of France, Philippe d'Orléans that aimed to depose him of his position and place Philip V, then King of Spain, as the new regent of France.
[2] Also involved was the Duke of Richelieu, who was then having a romantic affair with one of the Regent's daughters, Charlotte Aglaé d'Orléans.
[6] After the plot was uncovered, Montmorency was interrogated at the Bastille and imprisoned at the Fortress of Vincennes.
[b] She was the daughter of (a) Jean de Turménies (aka Turményes) (c. 1640–1702), Lord of Nointel and Presle, and (b) Marie Anne Le Bel (1642–1695).