In 1685 he appeared once more at Green Bay, this time holding the position of Commandant of the West, with a little company of twenty soldiers. He now had almost unlimited authority to explore and traffic as he would, for the only salary an official of that sort used to get, in New France, was the right to trade with the Indians. He had already lost money in working for the government as an Indian agent, and his present operations were wholly directed toward getting it back again. He went up the Fox and down the Wisconsin, and then ascended the Mississippi to trade with the wild Sioux tribe. For headquarters, he erected a little log stockade on the east bank of the Mississippi, about a mile above the present village of Trempealeau, and south of the mouth of Black River. In the year 1888, the site of this old stockade was discovered by a party of historical students, and many of the curious relics found there can now be seen in the museum of the State Historical Society, at Madison. All through the winter of 1685-86, Perrot traded here with the Sioux. He had a most captivating manner of treating Indians; for a long time, few of them ventured to deny any request made by him. Chiefs from far and near would come to the Trempealeau "fort," as it was called, and hold long councils and feasts with the great white chief, and more than once he was subjected to the curious Sioux ceremony of being wept over. A chief would stand over his guest and weep copiously, his tears falling upon the guest's head; when the chief's tear ducts were exhausted, he would be relieved by some headman of the tribe, who in turn was succeeded by another, and so on until the guest was well drenched. This must have been a very trying experience to Perrot, but he was shrewd enough to pretend to be much pleased by it. In the spring of 1686, the same year in which he gave the silver _ostensorium_ to the Jesuit chapel at De Pere, the commandant proceeded up the Mississippi to the broadening which was, about this time, named Lake Pepin by the French. On the Wisconsin shore, not far above the present village of Pepin, he erected another and stronger stockade, Fort St. Antoine. It was here, three years later, that, after the manner of Saint Lusson at Sault Ste. Marie, he formally took possession, in the name of his king, of all the Upper Mississippi valley.