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 André'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.