Abstract
Dr. Jonathan Letterman was a crucial innovator in the fields of combat and emergency medicine during the American Civil War. In a time that saw some of the bloodiest battles being fought on American soil, Dr. Letterman provided essential breakthroughs in military medicine that prevented thousands of soldiers from perishing. Through improvements in military camp sanitation, the establishment of an ambulance corps and the creation of an official evacuation plan and triage system for the wounded, Dr. Letterman's work not only helped save the lives of countless soldiers fighting in the Civil War, but in future wars to come as well. In addition, his service to his men and his country helped champion mandatory healthcare for the wounded soldier, an idea that would be eventually passed into Congressional law as the Letterman Plan. His life and legacy of improving military medicine amidst America's deadliest war are a testament to how he is aptly nicknamed "The Father of Battlefield Medicine".