Anyone interested in Texas’s military history will want to have a copy of this study. Military historians will certainly consult Under the Double Eagle for their research, and this publication will be oft-cited in years to come. It is the gold standard on this topic. The wealth of data it contains is a treasure trove for researchers, genealogists, etc. This will be a standard reference work found on many readers’ bookshelves and in libraries across the state. The amount of research compiled in this manuscript is staggering. Smith is known for the depth and breadth of his scholarship, and this study is no exception. Those who follow in his footsteps will use this work as a starting point for in-depth profiles of doctors, surgeons, and other citizen employees, incorporating Smith’s data with letters, journals, diaries, newspapers, and other published accounts. Smith has provided an excellent reference work that is certain to be put to good use." - Glen Sample Ely, author of The Texas Frontier and the Butterfield Overland Mail, 1858–1861"Having read hundreds of manuscripts over four decades, I can safely say this is one of the most impressively I have seen. With a complete list of all the military outposts in the Lone Star State and details on individuals employed by the army during these six decades, the study will be valuable to anyone interested in Texas history or military history in general." - Jerry Thompson, author of Tejano Tiger: Jose de los Santos Benavides and the Texas-Mexico Borderlands, 1823–1891