Ambrose Bierce was a 19th century American author known for his satirical writing and short story "An Occurrence at Owl Creek Bridge." He fought in the Civil War and later became a journalist in California. In 1913, he traveled to Mexico during the revolution and disappeared, with his fate remaining a mystery. His famous story "An Occurrence at Owl Creek Bridge" is set during the Civil War and features a surprise ending where the main character's escape is revealed to be an illusion. The story is praised for its modern techniques and examination of reality versus illusion.