The massacre of the British garrison of Michilimackinac in 1763, the investment of the fort of Detroit in the same year by a combined force of Indian tribes, and the development of an extensive conspiracy, as it has been termed, against the western British posts under Pontiac, constituted a new feature in American history; and the military expeditions of Cols. Bouquet and Bradstreet, towards the West and North-west, were the consequence. These movements became the means of a more perfect geographical knowledge respecting the West than had before prevailed. Hutchinson's astronomical observations, which were made under the auspices of Bouquet, fixed accurately many important points in the Mississippi valley, and furnished a framework for the military narrative of the expedition. In fact, the triumphant march of Bouquet into the very strongholds of the Indians west of the Ohio, first brought them effectually to terms; and this expedition had the effect to open the region to private enterprise.
The defeat of the Indians by Major Gladwyn at Detroit had tended to the same end; and the more formal march of Colonel Bradstreet, in 1764, still further contributed to show the aborigines the impossibility of their recovering the rule in the West. Both these expeditions, at distant points, had a very decided tendency to enlarge the boundaries of geographical discovery in the West, and to stimulate commercial enterprise.
The Indian trade had been carried to fort Pitt the very year of its capture by the English forces; and it may serve to give an idea of the commercial daring and enterprise of the colonists to add, that, so early as 1766, only two years after Bouquet's expedition, the leading house of Baynton, Wharton & Morgan, of Philadelphia, had carried that branch of trade through the immense lines of forest and river wilderness to fort Chartres, the military capital of the Illinois, on the Mississippi.[3] Its fertile lands were even then an object of scarcely less avidity.[4] Mr. Alexander Henry had, even a year or two earlier, carried this trade to Michilimackinac; and the English flag, the symbol of authority with the tribes, soon began to succeed that of France, far and wide. The Indians, finding the French flag had really been struck finally, submitted, and the trade soon fell, in every quarter, into English hands.