Who or what is the antagonist of the story "An Occurrence at Owl Creek Bridge"?

I have
stated elsewhere my view that in a story of this type theandare great powers whose conflict
affects the fates of unimportant individuals like Peyton Farquhar (who seems modeled after John
Wilkes Booth). The protagonist and antagonist in my view would be the North and the South. Since
the North seems to have the momentum at this point in the Civil War, I would choose the North as
the protagonist and the South as the antagonist. The Union officers and soldiers do not seem to
be acting as individuals but as pawns being moved by some invisible force above and beyond them.
Even Peyton Farquhar seems to be moved by something he only vaguely understands. Hundreds of
thousands of men fought and killed each other without hating each other or really understanding
why they were fighting. It seems to me that this was the feeling that --famous as a cynic,
pessimist and nihilist--was trying to capture in his story.