As citizens of a neutral nation from 1914 to early 1917, Americans were prohibited from serving in a foreign army, but many brave young souls soon made their way into European battle zones: as ambulance drivers, nurses, and more dangerously, as soldiers in the French Foreign Legion. It was partly from the ranks of the latter group, and with the sponsorship of an expat American surgeon and a Vanderbilt, that the Lafayette Escadrille was formed in 1916 as the first and only all-American squadron in the French Air Service. Flying rudimentary planes, against one-in-three odds of being killed, these fearless young men gathered reconnaissance and shot down enemy aircraft, participated in the Battle of Verdun and faced off with the Red Baron, dueling across the war-torn skies like modern knights on horseback.