From The Poetry Foundation:
Ambrose Bierce’s literary reputation is based primarily on his short stories about the Civil War and the supernatural—a body of work that makes up a relatively small part of his total output. Often compared to the tales of Edgar Allan Poe, these stories share an attraction to death in its more bizarre forms, featuring depictions of mental deterioration, uncanny, otherworldly manifestations, and expressions of the horror of existence in a meaningless universe. Like Poe, Bierce professed to be mainly concerned with the artistry of his work, yet critics find him more intent on conveying his misanthropy and pessimism. In his lifetime Bierce was famous as a California journalist dedicated to exposing the truth as he understood it, regardless of whose reputations were harmed by his attacks. For his sardonic wit and damning observations on the personalities and events of the day, he became known as “the wickedest man in San Francisco.”
Bierce was born in Meigs County, Ohio. His parents were farmers and he was the tenth of thirteen children, all of whom were given names beginning with “A” at their father’s insistence. The family moved to Indiana, where Bierce went to high school; he later attended the Kentucky Military Institute. At the outbreak of the Civil War, he enlisted in the Union army. In such units as the Ninth Indiana Infantry Regiment and Buell’s Army of the Ohio, he fought bravely in numerous military engagements, including the battles of Shiloh and Chickamauga and in Sherman’s March to the Sea. After the war Bierce traveled with a military expedition to San Francisco, where he left the army and prepared himself for a literary career.
Bierce’s early poetry and prose appeared in the Californian. In 1868 he became the editor of The News Letter, for which he wrote his famous “Town Crier” column. Bierce became something of a noted figure in California literary society, forming friendships with Mark Twain, Bret Harte, and Joaquin Miller. In 1872 Bierce and his wife moved to England where, during a three-year stay, he wrote for Fun and Figaro magazines and acquired the nickname “Bitter Bierce.” His first three books of sketches —Nuggets and Dust Panned Out in California (1872), The Fiend’s Delight (1873), and Cobwebs from an Empty Skull (1874)—were published during this period. When the English climate aggravated Bierce’s asthma he returned to San Francisco. In 1887 he began writing for William Randolph Hearst’s San Francisco Examiner, continuing the “Prattler” column he had done for the Argonaut and the Wasp. This provided him with a regular outlet for his essays, epigrams, and short stories.
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Along with his tales of terror, Bierce’s most acclaimed work is The Devil’s Dictionary (1906), a lexicon of its author’s wit and animosity. His definition for “ghost”—”the outward and visible sign of an inward fear”—clarifies his fundamentally psychological approach to the supernatural. In The Devil’s Dictionary Bierce vented much of his contempt for politics, religion, society, and conventional human values. A committed opponent of hypocrisy, prejudice, and corruption, Bierce acquired the public persona of an admired but often hated genius, a man of contradiction and mystery. In 1914 he informed some of his correspondents that he intended to enter Mexico and join Pancho Villa’s forces as an observer during that country’s civil war. He was never heard from again, and the circumstances of his death are uncertain.
Link to the rest at The Poetry Foundation