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?
Sentence (from "Battle of Gettysburg"): Union Maj. Gen. George Meade's Army of the Potomac defeated attacks by Confederate Gen. Robert E. Lee's Army of Northern Virginia, halting Lee's invasion of the North.
Relevant evidence: Yes