The Alsatian smuggler who helped Napoleon to capture the Austrian army.--Belle Boyd, the Confederate girl who saved Stonewall Jackson.--The Indian scout who was the hero of King Philip's war.--How the suicide of a staff officer once averted war betwen Austria and Russia.--The romantic side of Major Andre's unsuccessful exploit.--The strange adventures of the Chevalier D'Eon at the Russian court.--How Napoleon's chief spy hoodwinked the Emperor of Austria.--Lydia Darrah, the brave Quakeress who saved Washington's army from destruction.--Doctor Steiber and the mystery of the Franco-Prussian war.--The adventure of Private Morgan in the camp of Cornwallis.--The mysterious and romantic case of General Napper Tandy.--How Monsieur de Meinau helped to make Jerome Bonaparte king of Westphalia.--The strange mystery surrounding the betrayal of Captain Nathan Hale.--Major Le Caron and the Fenian invasion of Canada.--How Emma Edmonds penetrated the Confederate lines.--The amazing adventure of Brigadier-General Lafayette C. Baker.--The mysterious "F" and the captured troopers.--The mysterious man who asked for a light.--Carl Lody and spies of the world's greatest war.