From the Buffalo Journal.

Important army movements.-We understand that Fort Niagara is immediately to be garrisoned by four companies of the second regiment of United States' infantry; and report says, that this fort will be made headquarters of the frontier line of posts. By the Detroit papers we are informed of several new arrangements made in the West by the War Department. Among which are the re-occupancy of Fort Dearborn (Chicago) and Fort Gratiot. But the most important measure of the department we conceive to be that of establishing new posts immediately upon the portage between the Fox and Ouisconsin Rivers, in the country of the Winnebago Indians. Permission for this was obtained of the natives at the late Treaty at Green Bay. The post will be called Fort Winnebago, and is to be garrisoned by two companies of the first regiment of United States' infantry. This fort will occupy the only intervening land, (a portage but six miles) between the chain of western lakes and the Mississippi River. The position is about central between Prairie du Chien, on the Mississippi, and Green Bay, and upon the extreme northern verge of mining country. To obtain a cession of this district to the United States, was among the objects to be embraced in the late Treaty at Green Bay. The purchase was not effected, but permission was obtained to occupy the mining district, until all the Indians interested in the sale can be collected, at a council which shall convene the ensuing summer, probably at Galena, when there seems little doubt the arrangement will take place. In the meantime, the Indians propose to inform themselves of the numbers of the whites, by actual observation; for which purpose, fifteen of their principal men came to Detroit, in the Clay, on their way to Washington. They propose visiting, before they return, the seaports of New England, and many of the large interior towns of the country. 'This,' says the Michigan Herald, 'will doubtless have a powerful effect on those savages, who have heretofore considered themselves equal in numbers to the whites, and more brave and warlike. They will soon be convinced of their error, in regard to the numerical strength of the people of the United States, and, of course, less willing to put their bravery tot he trial.'

Should the proposed treaty, the ensuing summer result favorable, we trust no time will be lost in rendering perfect the navigation between the Fox and Ouisconsin Rivers, and thus opening the way by the short route of emigration which is ready, through that channel, to penetrate the forests of the West.