Lt. Gustavus Doane was a member of the 1870 Yellowstone Expedition led by Henry Washburn. Washburn requested military support from General Hancock of the US Army who selected Doane to lead a detail of five soldiers from Fort Ellis in Montana to accompany the expedition. This is Doane's journal submitted by the War Department to the US Senate reporting on the observations of the expedition. The record kept by Doane is recognized as a significant contribution to the subsequent creation of Yellowstone National Park. - Summary by Fritz