This important historical document provides a detailed account of a military reconnaissance mission in the American West in the mid-19th century. James Hervey Simpson led the expedition, which was tasked with exploring the Navajo Country and establishing relations with the local tribes. Through Simpson's meticulous journal entries, readers get a firsthand look at the challenges and successes of this groundbreaking mission. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.