 From Bozeman, they moved to the shadows of Bozeman Pass, camping four miles east of Fort Ellis.On September 10, 1869 they struck out over the pass and down Trail Creek  to reach the Yellowstone River near Emigrant Gulch.They followed the river south until they entered the park region on September 13, 1869, at the confluence of the Gardner and Yellowstone rivers near present-day Gardiner, Montana.