...vacuation of the seaboard by the British was completed in November, 1783, the northern and western frontier posts continued to be held by British garrisons. These were Oswegatchie (now Ogdensburg), Oswego , Niagara, Presque Isle (now Erie), Sandusky, Detroit, Mackinaw, and some of lesser importance. The occupation of these posts by garrisons did not enter into the calculations for an immediate peace ...