This publication of George Croghan's journal and related correspondence marks its first release from the papers of General Thomas Gage found in the William L. Clements Library. Edited by Howard H. Peckham, the journal meticulously preserves the original manuscripts' spelling, capitalization, and punctuation, with minor standardizations. The preface acknowledges contributions from experts and extends gratitude to Dexter M. Ferry, Jr. for making the publication possible. The contents include a preface, introduction, correspondence, journal, appendix, and index. The introduction provides historical context about George Croghan, an influential Pennsylvania trader whose efforts significantly advanced English penetration into the western wilderness before the American Revolution. It chronicles Croghan's endeavors, including his trade with various tribes, interactions during French and Indian conflicts, and his role in British colonial administration. The text details Croghan's 1767 mission involving a diplomatic journey to Detroit to pacify Indian unrest, inquire into official conduct, and address potential hostile actions by the tribes. The book sheds light on Croghan’s important yet challenging role in early American frontier diplomacy and the British colonial endeavor.