Harrie Irving Hancock (1866? -1922) was an American chemist and writer, mainly remembered as an author of children's literature and for writing fiction about the Germans invading the United States. Hancock's books for boys depicted boys in a grown up manner and used the same heroes in multiple books. Hancock's topics included westerns, detective stories (set in New Orleans and in Asia), and historical adventures. and locations in China and Japan. The Uncle Sam's Boys series included: Uncle Sam's Boys in the Ranks: or, Two Recruits in the United States Army, Uncle Sam's Boys on Field Duty: or, Winning Corporal's Chevrons, Uncle Sam's Boys as Sergeants: or, Handling Their First Real Commands, Uncle Sam's Boys in the Philippines: or, Following the Flag Against the Moros, Uncle Sam's Boys on their Mettle: or, a Chance to Win Officers' Commissions, Uncle Sam's Boys as Lieutenants: or, Serving Old Glory as Line Officers, Uncle Sam's Boys with Pershing's Troops at the Front: or, Dick Prescott at Grips with the Boche, Uncle Sam's Boys as Lieutenants: or, Serving Old Glory as Line Officers, and Uncle Sam's Boys Smash the Germans: or, Helping the Allies Wind Up the Great World War.