Question: "The Realm of the Unreal" is a short story by a Civil War soldier, of which nationality, wit, and writer Ambrose Bierce?

Context paragraphs:
The Boarded Window: "The Boarded Window: An Incident in the Life of an Ohio Pioneer" is a short story by American Civil War soldier, wit, and writer Ambrose Bierce.  It was first published in "The San Francisco Examiner" on April 12, 1891 and was reprinted the same year in Bierce's collection "Tales of Soldiers and Civilians".  The setting for the story is that part of Ohio where Bierce's family lived until 1846.

A Horseman in the Sky: "A Horseman in the Sky" is a heavily anthologized short story by American Civil War soldier, wit, and writer Ambrose Bierce.  It was published on April 14, 1889 under the title "The Horseman in the Sky" in the Sunday edition of "The Examiner", a San Francisco newspaper owned by William Randolph Hearst.  It is set during the American Civil War and is one of Bierce's best known war stories.  Bierce revised the story for his book "Tales of Soldiers and Civilians".

Killed at Resaca: "Killed at Resaca" is a short story by American Civil War soldier, wit, and writer Ambrose Bierce.  First published in "The San Francisco Examiner" on June 5, 1887, it was later included in Bierce's "Tales of Soldiers and Civilians" in 1891.

The Realm of the Unreal: "The Realm of the Unreal" is a short story by American Civil War soldier, wit, and writer Ambrose Bierce.  It appeared in "The San Francisco Examiner" on July 20, 1890 and was reprinted in the 1893 collection "Can Such Things Be?"

An Unfinished Race: "An Unfinished Race" is a short story by American Civil War soldier, wit, and writer Ambrose Bierce.  The story, dealing with a mysterious disappearance of a man, was first published in "The San Francisco Examiner" on October 14, 1888 and was included in Bierce's collection "Can Such Things Be? " (1893).  Bierce himself mysteriously disappeared in October 1913.

Ambrose Bierce: Ambrose Gwinnett Bierce (June 24, 1842 – circa 1914) was an American Civil War soldier, wit, and writer.

An Inhabitant of Carcosa: "An Inhabitant of Carcosa" is a short story by American Civil War soldier, wit, and writer Ambrose Bierce.  It was first published in the "San Francisco Newsletter" of December 25, 1886 and was later reprinted as part of Bierce's collection "Can Such Things Be? "

An Occurrence at Owl Creek Bridge: "An Occurrence at Owl Creek Bridge" is "one of the most famous and frequently anthologized stories in American literature"; and was written by American Civil War soldier, wit, and writer Ambrose Bierce.  Originally published by "The San Francisco Examiner" on July 13, 1890, it was first collected in Bierce's 1891 book "Tales of Soldiers and Civilians".  The story, which is set during the Civil War, is famous for its irregular time sequence and twist ending.  Bierce's abandonment of strict linear narration in favor of the internal mind of the protagonist is considered an early example of experimentation with stream of consciousness.

Tales of Soldiers and Civilians: Tales of Soldiers and Civilians is a collection of short stories by American Civil War soldier, wit, and writer Ambrose Bierce, also published under the title "In the Midst of Life".  With a stated publication date of 1891 (but actually published in early 1892), the stories describe unusual incidents in the lives of soldiers and civilians during the American Civil War.  "Tales of Soldiers and Civilians" was named by the Grolier Club as one of the 100 most influential American books printed before 1900, stating "These short stories are among the finest, and best known, in American literature. . . .  Written in a clear simple style, with each phrase contributing to the total effect, Bierce's tales pointed the way for the American short-story writer."  Bierce's famous story "An Occurrence at Owl Creek Bridge" is included in this collection.

One of Twins: "One of Twins" is a short story by American Civil War soldier, wit, and writer Ambrose Bierce exploring a telepathic connection between the twins.  It was first published in "The San Francisco Examiner" on October 28, 1888 and was included in Bierce's 1893 collection of supernatural tales "Can Such Things Be? "

Supporting paragraphs: The Realm of the Unreal Ambrose Bierce
Answer: American