Governor Clark had heard that the British, by this time strongly intrenched on Mackinac Island, intended to send an expedition up the Fox River and down the Wisconsin, to seize upon Prairie du Chien, which had not been fortified since the old French days. Clark recognized that the power that held Prairie du Chien practically held the entire Upper Mississippi River, and controlled the Indians and the fur trade of a vast region. Accordingly, early in June (1814) he ascended the river from his headquarters at St. Louis, with three hundred men in six or eight large boats, including a bullet-proof keel boat, and erected a stockade on the summit of a large Indian mound which lay on the bank of the Mississippi a mile or two above the mouth of the Wisconsin. The name given to this stockade was Fort Shelby. Lieutenant Joseph Perkins was left in charge of the garrison, which was divided between the fort and the keel boat, the latter being anchored out in the Mississippi. The British expedition from Mackinac had been greatly delayed. During the preceding autumn, Robert Dickson, an English fur trader, had been engaged in recruiting a large band of Indians in the neighborhood of Green Bay, and with them intended to occupy Prairie du Chien. But the Indians were evidently afraid to fight the Americans, and delayed Dickson so that the canoes of his party were caught in the ice on Lake Winnebago (December, 1813), and he was obliged to go into winter quarters on Island Park (known to the white pioneers as Garlic Island). Poor Dickson had a sorry time with his war party. As soon as it was learned that provisions were being freely given out at this island camp, Indians from long distances came to visit him, under pretense of enlisting under the banner of the British chief. Councils innumerable were held, presents and food had to be given the visitors continually, and Dickson was put to sore straits to keep them satisfied. He found it impossible to get sufficient supplies from British headquarters on Mackinac Island, and was being severely criticised by the officers there, for his exorbitant demands upon them. Nevertheless, unless he kept his Indians good-natured, they would promptly desert him. He was, therefore, forced to rely upon the French of Green Bay for what food he needed. This came grudgingly, and at so high prices that Dickson roundly scolded the Green Bay people, and promised to report them for punishment to the British king, for daring to take advantage of his Majesty's necessities. While Dickson was thus engaged in Lake Winnebago, a British captain was drilling a number of young Frenchmen at Green Bay, and trying to make soldiers of them; at Mackinac, a similar work was being done among the _voyageurs_ by the two leading fur traders of Prairie du Chien, Brisbois and Rolette. On the other hand, at Prairie du Chien, the American Indian agent, Boilvin, was issuing circulars calling on the people to claim American protection before it was too late.