In "An Occurrence At Owl Creek Bridge," why does Farquhar want to destroy the Owl Creek Bridge?

Peyton Farquhar, we
learn at the beginning of Section II, was a "well-to-do planter, of an old and highly
respected Alabama family."  He was a slave owner and a secessionist, "ardently devoted
to the Southern cause."  In other words, he was very much in favor of the Confederacy
seceding from the Union (the southern states forming their own country, distinct from the
northern ones).  This story, then, we now know is set during the era of the American Civil War,
deep into the war when the army from the north was...