Sons of Virginia (2007)

Daniel Neal and his Older brother josh grew up together on a farm in Northern Virginia. Daniel the hard working salt of the earth type and Josh the smart bookish one. After their father dies Josh leaves the family when he's 17 to go north and get an education. The family never hears from him again, until one day many years later on a battlefield in northern Virginia, during one of the biggest battles between the North and The South the two brother meet again only each is fighting for the other side.