I don't blame them. I have shoes, yet typically choose to go barefoot. Was it just something common in rural America during the 19th century, to save shoes for the colder months by going barefoot?
Good question! I'm not sure I know the answer. It did make me think of the narrative Leander Stillwell (61st Illinois), who recounts on several occasions that the boys in his unit would take their shoes off on the march whenever the roads got muddy. It was mainly a matter of practicality--easier to march through mud that way and saved their shoes, but--as Stillwell also seems to hint at--there was a bit of joy in it.