The overall feeling that I get from reading this story is one of regret. Even though I think that the South's cause in the Civil War was evil, I cannot help but feel bad for Farquhar.
In the story, I come to identify with Farquhar. I feel happy for him when he falls in the water and is, seemingly, alive. I feel sorry for him when I find out that he committed his crime only after he was sort of conned into doing it by the Union soldier who was, himself, breaking the laws of war (by going around dressed as a Confederate).
Because of these touches, I feel sympathy for Farquhar and I feel regret at the end of the story when I find he is dead.