Ever read Brook's exploratory report on Mt. McKinley? Never forget those "Athabaskan Geologists" Brooks Report on Mt. McKinley, States Clearly, Page 28; 
"On June 1, 1899, a party of six white men and two natives, with fifteen horses, commanded by Lt. (now Capt.) Joseph S. Herron, was landed on the north bank of the Kichatna, a northern tributary of the Yenta, from a steamer which had been brought to Cook Inlet for the use of the expedition...All went well so far, but in crossing the range he passed beyond the hunting grounds of his two native guides. Terrified at the thought of penetrating an unknown country, the two valiant warriors stole away one night, but Herron determined to continue his march in the hope of finding other natives..."

Alfred Brooks USGS, 

Thank God Teddy Roosevelt had a brain also.

http://pubs.usgs.gov/pp/0070/report.pdf