This Dec. 3, 2011 photo provided by Dave Maher shows some of the 23,110 luminaries placed throughout the northern portion of the Antietam battlefield to commemmorate each of the casualties near Sharpsburg, Md. The battle marked a crucial pivot point in the war. And yet it might never have occurred - if not for what a historian calls a "freakish" twist of fate. Days earlier, a copy of Gen. Robert E. Lee's detailed invasion orders, wrapped around a few cigars, accidentally fell in a farm field and were discovered by Union infantrymen who passed their stunning find up the chain of command, spurring action. (AP Photo/David Maher)
