In 1664, the Marquis de Tracy was appointed viceroy of New France. From his base in Quebec City, he initiated a brutal war against the Iroquois peoples and after defeating them and destroying their crops and villages, he launched an attack against the Mohawk tribe and causing destruction to their territory. Marquis Alexandre de Prouville de Tracy seized all the Mohawk lands in the name of the king of France, and forced the Mohawks to accept the Roman Cathoilic faith and to adopt the French language as taught by the Jesuit missionaries.
Marquis Alexandre de Prouville de Tracy died at his castle in France in 1670.