Charles Sweeny (1882-1963) was the heir to a fortune. Renouncing a life of comfort, he became a warrior for causes he believed in. Twice kicked out of West Point, he fought in revolts against three Latin American dictators. He was a decorated officer in the French Foreign Legion and in the U.S. Army during World War I, a brigadier general in the Polish-Soviet War and a military advisor in the Greco-Turkish War. He lead a flying squadron in Morocco's Rif War, advised Loyalists in the Spanish Civil War and spied for French intelligence during World War II. Before America entered the war, he...