sentences:  It ascended to and followed a firm gravelly ridge which was once among the higher beaches or strandlines of that ancient lake, forded the Red Lake River at the Old Crossing near modern Huot, and angled south by southeast to the fur post at White Earth.At Otter Tail Lake, the route left the plains and turned east into a forest in the Leaf Mountains on the continental divide.Taking a difficult but scenic path east through the woods, the trail crossed the Mississippi River at Old Crow Wing.