Question: What battle was fought by Greenwich Union soldiers, in which General Mead's Army of the Potomac defeated General Lee's North Virginia Army resulting in the largest number of casualties in a single war?
{'answer': 'Battle of Gettysburg', 'supporting_facts': [['Greenwich in the American Civil War', 0], ['Greenwich in the American Civil War', 1], ['Battle of Gettysburg', 0], ['Battle of Gettysburg', 1], ['Battle of Gettysburg', 2]]}