This volume investigates the institutional evolution of the United States Army Medical Department from its formal establishment in 1818 through the conclusion of the American Civil War in 1865. Mary C. Gillett, a historian specializing in military medical records, utilizes primary source documentation and administrative archives to argue that this period marked the professionalization of military medicine. The text details how the department transitioned from a loosely organized group of physicians into a structured, disciplined corps of medical officers capable of managing large-scale wartime health crises.

Historians and military researchers frequently cite this work as a foundational administrative history for understanding the development of the U.S. Army Medical Department. Readers note the academic density of the prose, which serves as a reliable reference for scholars interested in the structural evolution of military institutions.