On the other hand, the Iroquois were the implacable enemies of the French and their allies, and the friends of the English. They were distributed over a territory which embraced the Lake Ontario regions and which extended to the English settlements of the East, thus offering a free and safe road of travel to English traders into the domains of the French. Reduced to less than a quarter of the fighting strength that they had possessed before the wars of extermination, they were still the terror of all other Lake tribes, and the English were not slow to take advantage of the opportunities which their friendship offered them. At every possible point the Five Nations checked the movements of the French, and at the same time assisted the English traders to invade their territory. In 1684, De la Barre, then Governor of Canada, determined to destroy this last menace to French dominion, and sent word throughout the Lake regions calling upon his warrior allies to assemble at Niagara for a great war of extermination upon the Iroquois. De la Barre himself proceeded to Lake Ontario with a powerful force of nearly two thousand men, but an epidemic of sickness attacked his army and the only result of the “campaign of extermination” was a peaceful conference with the Oneidas, Onondagas, and Cayugas. The failure of De la Barre’s plans was the first great blow to French dominion. The English traders became more daring and parties penetrated even as far as Michilimackinac, one of the French strongholds. These traders were regarded as fair game by the French wherever found, but though several parties were captured the invasion from the East did not cease. Alarmed at the growing danger, the French determined to make another campaign against the Iroquois. To the existence of the Five Nations they ascribed their peril. With these fierce warriors out of the way they could easily hold the English back. In 1687, the Marquis Denonville, who had succeeded De la Barre, gathered two thousand troops and six hundred Indian warriors at Montreal, and with the advice that a thousand Indian allies would meet him at Niagara set out for the land of the Iroquois. On June 23d, the forces met at Fort Frontenac and from there proceeded to Irondequoit, in the enemy’s country. Only the Senecas, one branch of the Five Nations, had gathered to meet the invaders, and in the fierce battle that followed, the French and their allies were defeated and driven to the shores of the lake. Satisfied with their victory, the Senecas did not press the invaders, and Denonville took advantage of his opportunity to build Fort Niagara, after which he led the remnant of his defeated army back to Montreal, leaving a garrison of one hundred men in the new stronghold. During the winter that followed, the Senecas besieged the fort with such success that less than a dozen of its defenders escaped with their lives.