"An Occurrence at Owl Creek Bridge" Questions

As the story begins, what event is about to happen on the bridge?
Which side does Farquhar support in the Civil War?
Why has he been sentenced to die?
Did you see that coming?

The event about to happen on the bridge is Farquhar's execution by hanging. Farquhar supports the Confederate side in the Civil War. He has been sentenced to die because he attempted to sabotage the Union's military operations by attempting to burn down the bridge. The twist ending of the story, where it is revealed that Farquhar's escape was just a hallucination as he is actually already dead, is unexpected for many readers.