In "An Occurrence at Owl Creek Bridge," what are both the internal and external conflicts in the story?

The external conflict is, I think, a little easier to describe.  Peyton Farquhar is about to be hanged for the crime of attempting to burn down the Owl Creek Bridge, part of an important railroad line, during the Civil War.  Therefore, an external conflict exists between Farquhar, who would prefer to retain his life, and the Union soldiers who hang him.

However, the crux of the story -- and what makes it really interesting -- is the way time strangely slows down while Farquhar awaits his punishment and as he falls into the noose.  His internal conflict isn't a typical kind of conflict; he isn't torn between two things that he wants or doesn't want.  His conflict seems to arise from the fact that he cannot seem to accept his fate; it's as though the conflict exists between reality and his mind.  He is able to imagine that he escapes, swims the creek, travels miles and miles through the woods, and finally arrives at his home, a journey that should take a whole day or even two, all in the brief moment during which he drops from the bridge.  It is as though his senses, in his mind, have become preternaturally keen, but what is actually happening is that he is concocting a sort of wish-fulfillment fantasy of escape.  Unable to cope with his reality, Farquhar creates a conflicting one within his mind, and this makes the final lines of the story -- where the noose snaps his neck -- all the more jarring for the reader.