Last week, July 1 marked 150 years since the beginning of the Battle of Gettysburg, a crucial victory for the Union and a turning point in the Civil War. But it came at an enormous cost to both sides — thousands of soldiers were killed and tens of thousands more were wounded.
However, it might have been even worse had it not been for a surgeon named Jonathan Letterman, who served as the chief medical officer of the Union's Army of the Potomac. He presided over some of the bloodiest battles in U.S. history and, over the course of a single year, revolutionized military medicine.
Scott McGaugh has just released his biography of Letterman, called Surgeon in Blue. He joins NPR's Rachel Martin to discuss the father of battlefield medicine, what conditions were like before he came along and the legacy he left behind.