The source or sources of the Mississippi was, as we have seen, an important matter in settling the boundary line between the possessions of Great Britain and the United States. The matter having occupied the authorities at Washington, Zebulon M. Pike, a lieutenant of the United States army, was sent to examine the country upon the Upper Mississippi and to maintain the interests of the Government in that quarter. Leaving St. Louis on August 9th, 1805, he ascended the "Father of Waters," and reached Prairie du Chien in September. Here he was met by the well-known free-traders who carried on the fur trade in this region. Their names were Fisher, Frazer and Woods. These men were in the habit of working largely in harmony with the North-West Company traders, and, on account of their British origin, were objects of suspicion to the United States authorities. Pushing on among the Indians, by the help of French Canadian interpreters, he came to Lake Pepin. On the shores of this lake Pike met Murdoch Cameron, the principal British free-trader on the upper Minnesota River. Cameron was a shrewd and daring Scotchman, noted for his generosity and faithfulness. He was received with distinction by Pike, and the trader as shown by his grave, pointed out many years afterward on the banks of the Minnesota, was in every way worthy of the attention. Shortly after this, Pike passed near where the city of St. Paul, Minn., stands to-day, the encampment of J. B. Faribault, a French Canadian free-trader of note, whose name is now borne by an important town south of St. Paul. Pike held a council with the Dakota Indians, and purchased from them a considerable amount of land for military purposes, for which the Senate paid them the sum of two thousand dollars. Pike seems to have cautioned the Dakotas or Sioux to beware of the influence of the English, saying, "I think the traders who come from Canada are bad birds among the Chippeways, and instigate them to make war upon their red brothers, the Sioux." About the end of October, unable to proceed further up the Mississippi on account of ice, Pike built a blockhouse, which he enclosed with pickets, and there spent the most severe part of the winter. At his post early in December he was visited by Robert Dickson, a British fur trader, described by Neill as "a red-haired Scotchman, of strong intellect, good family, and ardent attachment to the crown of England, who was at the head of the Indian trade in Minnesota." Pike himself speaks of Dickson as a "gentleman of general commercial knowledge and of open, frank manners." Explanations took place between the Government agent and the trader as to the excessive use of spirits by the Indians.