The landmarks at Antietam National Battlefield already include one agricultural feature, the cornfield. Soon there will be another: the apple orchard.Rangers and volunteers plan to plant 350 apple trees this fall to help restore the Piper farm, one of the homesteads on the property, to the way it looked on the eve of the Civil War's bloodiest one-day battle.A nursery in Michigan is supplying eight apple varieties - Baldwin, English Russet, Fornwalder, Gilpin, Jeffries, Maidenblush, McClellan and Northern Spy - for the project, said Joe Calzarette, Antietam's natural resources manager.Those varieties were historically grown in the region but are not...