In 1668 Green bay was again visited, this time by Nicolas Perrot and Toussaint Baudry who made several trips to inland tribes on the Wolf and upper Fox rivers with whom they con cluded trading treaties. Other traders came. In 1669 Allouez was succeeded at his Chequamegon mission by Father Marquette and went into the Fox river valley where at the first rapids he founded the mission of St. Francois Xavier, one of the most suc cessful of those established by the Jesuits in the west. It became the centre for further missionary efforts to all the surrounding tribes. In 1671 Father Marquette was forced by Indian wars to abandon the Chequamegon mission and in 1673, in company with Louis Joliet, he set off down the Fox-Wisconsin water route to discover the Mississippi river of which the Indians had told them. On July 17 they reached the mouth of the Wisconsin and sailed out upon the Mississippi waters.
In 1679 Daniel Greysolon Du Luth explored the upper Missis sippi, St. Croix and Black rivers. The same year Michel Accault, accompanied by Father Hennepin, explored the Mississippi along Wisconsin's western boundary until they met Du Luth who re turned with them by the Wisconsin-Fox route to the St. Francois Xavier mission. Du Luth continued his explorations on the Missis sippi and Lake Superior until 1689 when he left the west never to return. His work was supplemented by the Mississippi ex peditions of Perrot, who in 1686 built Fort St. Antoine on Lake Pepin, an enlargement of the Mississippi river. Perrot was now the French commandant in Wisconsin and most influential with the Indian tribes. In 1671 Saint-Lusson at Sault Ste. Marie had taken formal possession of the Great Lakes region in the name of the king of France; in 1689 Perrot staged a similar ceremony at his Fort St. Antoine on the Mississippi river. The 18 years between the two events had marked the period of French dis covery and occupation of Wisconsin. Traders entered the region in increased numbers, and to protect them from the Indians and to control the trade properly a military force was necessary.
In 1712 the slaughter of a band of Foxes near Detroit was the signal for hostilities which lasted almost continuously until 1740, and in which every tribe in the Wisconsin country was sooner or later involved either in alliance with the Foxes or with the French. This war seriously interfered with the French plan of trade and development. The difficulty of maintaining a chain of settlements which might have connected Canada and Louisiana was a contributing cause to the overthrow of French dominion. Wisconsin was little disturbed by the Seven Years' War. How ever, the French and Indians of Wisconsin contributed a force under the half-breed, Charles Michel de Langlade, which made the long journey to lower Canada to share in the war. With the fall of Montreal (1760), French rule in Wisconsin was over.
The close of the war, although it conveyed the region to the sovereignty of the United States, was not followed by American occupation. The newly formed North-west company, a British fur-trading organization, kept control of the posts, built new ones, extended their trade and dominated the region. The control of these posts was one of the issues in the War of for American traders were becoming powerful enough to demand that the British traders should be made to withdraw. The end of the war meant the termination of British influence in Wisconsin, and actual military occupation of the country by the United States came in 1816 with the establishment of garrisons at Green bay (Ft. Howard) and Prairie du Chien (Ft. Crawford).