It was the purpose of the Iroquois to master all this traffic, conquer the tribes who had possession of it, and divert the entire supply of furs to themselves, and through themselves to the English and Dutch. That English and Dutch traders urged them on is affirmed by the French, and is very likely. The accomplishment of the scheme would have ruined Canada. Moreover, the Illinois, the Hurons, the Ottawas, and all the other tribes threatened by the Iroquois, were the allies and "children" of the French, who in honor as in interest were bound to protect them. Hence, when the Seneca invasion of the Illinois became known, there was deep anxiety in the colony, except only among those in whom hatred of the monopolist La Salle had overborne every consideration of the public good. La Salle's new establishment of St. Louis was in the path of the invaders; and, if he could be crushed, there was wherewith to console his enemies for all else that might ensue. Bad as was the posture of affairs, it was made far worse by an incident that took place soon after the invasion of the Illinois. A Seneca chief engaged in it, who had left the main body of his countrymen, was captured by a party of Winnebagoes to serve as a hostage for some of their tribe whom the Senecas had lately seized. They carried him to Michillimackinac, where there chanced to be a number of Illinois, married to Indian women of that neighborhood. A quarrel ensued between them and the Seneca, whom they stabbed to death in a lodge of the Kiskakons, one of the tribes of the Ottawas. Here was a casus belli likely to precipitate a war fatal to all the tribes about Michillimackinac, and equally fatal to the trade of Canada. Frontenac set himself to conjure the rising storm, and sent a messenger to the Iroquois to invite them to a conference.