The American's battle of St. Mihiel in September 1918 has long been a marginalized battle in an almost forgotten war. In the historiography of American World War I involvement, the battle is relegated to a side-show that was little more than a distraction from the Meuse-Argonne. This stance needs to be re-evaluated as St. Mihiel proved an essential training ground for the US Army. The army rapidly expanded and participated in a major offensive, completed the complicated planning process, undertook a significant deception and intelligence-gathering campaign, and led coalition forces to reduce a salient that existed for years, in only a few short months. While not a perfect operation, the Americans overcame several obstacles to form the US First Army and achieve victory. St. Mihiel is a turning point in military training and doctrine as students studied the tactics after the war into the modern day. The memory of the battle was affixed in the minds of those who fought it and those on the home front who eagerly read the news stories coming from the Western Front. Modern audiences should also recognize the significance of the Battle of St. Mihiel.