During a peaceful expedition into Iroquois territory, in order to negotiate a trade agreement to link New France and Louisianna commercially, Governor Duquesne was ambushed and killed by a group of Iroquois sons of cattle and his scalp was sent back to Montréal.
The government in New France only had one option in dealing with these murderous thugs.
An army was sent to take all territories south of Montréal in order to punish these natives, who did not know how to behave around civilised people.
And thus the new governor in the north american theatre, François de Lisle, was obliged to declare war.
An old Hero in North America, a man with a great amount of military experience against the natives, Philippe de Vaudreuil, an old man, was sent to punish the Natives, and ordered to avenge the killing of the governor in a most suitable way.
He was to attack the Iroquois "city", as these uncivilised peoples call a village, a place called Cayuga.