Question: What  battle of the Civil War involved the largest number of casualties of the entire war and is often described as the war's turning point, Second Battle of Bull Run or Battle of Gettysburg?
Sentence (from "Second Battle of Bull Run"): It was the culmination of the Northern Virginia Campaign waged by Confederate Gen. Robert E. Lee's Army of Northern Virginia against Union Maj. Gen. John Pope's Army of Virginia, and a battle of much larger scale and numbers than the First Battle of Bull Run (or "First Manassas") fought on July 21, 1861 on the same ground.
Relevant evidence: No