Late in June the leaders of the expedition started from Mackinac, under the command of Major William McKay, and at Green Bay, Lake Winnebago, and Portage picked up various parties of French and Indians. These bands were much reduced from those who had been so liberally maintained during the winter, for most of the Indians were anxious to keep away from the fighting until it should be evident which side would win, and many of the French were of the same mind. By the time Fox River had been ascended by the fleet of canoes, and the descent of the Wisconsin begun, the allied forces consisted of but a hundred twenty whites and four hundred fifty Indians. All of the latter, according to McKay's report, proved "perfectly useless." On the 17th of July, the British war party landed at Prairie du Chien, to find the Americans, some sixty or seventy strong, protected by a stockade and two blockhouses, on which were mounted six small cannon. In the river, the keel boat contained perhaps seventy-five men and fourteen cannon. The British had, besides their muskets, only a three-pounder, and the situation did not look promising. Perkins was summoned to surrender, but he declared that he would "defend to the last man." For two days there was a rather lively discharge of firearms on both sides. Apparently, the British were the better gunners; their cannonading soon forced the men on the keel boat to desert their comrades on shore, and McKay then centered his attention on the fort. The Indians were unruly, being principally engaged in plundering the Frenchmen's houses in the village. The British supply of ammunition had quite run out by the evening of the 9th, and McKay was seriously contemplating a retreat, when he was surprised to see a white flag put out by the garrison. It appears that the stock of food had become exhausted in the fort, and Perkins had formed an exaggerated idea of the strength of the invaders. The British guaranteed that the Americans should march out of Fort Shelby at eight o'clock in the morning of the 20th, with colors flying and with the honors of war, and that the Indians should be prevented from maltreating them. This last agreement McKay found it very difficult to carry out, for the savages wished, as usual, to massacre the prisoners. To the honor of the British, it should be recorded that they exercised great vigilance, and spared neither supplications nor threats, to insure the safety of their prisoners, whom they soon sent down the river to the American post at St. Louis.