Ambrose Bierce was an American writer, critic and war veteran. Bierce fought for the Union Army during the American Civil War, eventually rising to the rank of brevet major before resigning from the Army following an 1866 expedition across the Great Plains. Bierce s harrowing experiences during the Civil War, particularly those at the Battle of Shiloh, shaped a writing career that included editorials, novels, short stories and poetry. Among his most famous works are An Occurrence at Owl Creek Bridge, The Boarded Window, Chickamauga, and What I Saw of Shiloh. While on a tour of Civil-War battlefields in 1913, Bierce is believed to have joined Pancho Villa s army before disappearing in the chaos of the Mexican Revolution.