Connected with so many of the aspects of western history, Old Fort Snelling is pictured in accounts both numerous and varied. The reports of government officials, the relations of travellers and explorers, and the reminiscences of fur traders, pioneer settlers, and missionaries show the Fort as each author, looking at it from the angle of his particular interest, saw it. These published accounts are found in the _Annual Reports_ of the Secretary of War, in the _Annual Reports_ of the Commissioner of Indian Affairs, and in the works of travellers and pioneers. Many of the most important sources are the briefer accounts printed in the _Minnesota Historical Collections_. The author's dependence upon these sources of information is evident upon every page of this volume. But not alone from these sources, which are readily accessible, is this account of the Old Fort drawn. A half-burned diary, the account books of the post sutler, letter books filled with correspondence dealing with matters which are often trivial, and statistical returns of men and equipment are sources which from their nature may never be printed. But in them reposes much of the material upon which this book is based. The examination of all the documents which offered any prospect of throwing light upon the subject was made possible for the author as Research Assistant in The State Historical Society of Iowa. And in this connection I wish to express my appreciation for the many courtesies which I have received from those in whose custody these sources are kept. To Dr. Solon J. Buck, Superintendent of the Minnesota Historical Society and the members of the library staff of that Society I am indebted for many kindnesses. Dr. M. M. Quaife, Superintendent of the State Historical Society of Wisconsin, placed at my disposal thousands of sheets of transcripts made from the records of the Indian Department at Washington and kept in the library of the Historical Society at Madison. At the Historical Department of Iowa at Des Moines, and in the library of the Kansas State Historical Society at Topeka opportunity was granted to examine valuable manuscripts. General H. P. McCain, Adjutant-General of the United States, had a search made of the records on file in the archives of the War Department at Washington, and such papers as dealt with Fort Snelling were consulted by the author.