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 "Battle of Gettysburg"): The Battle of Gettysburg ( , with an sound) was fought July 1–3, 1863, in and around the town of Gettysburg, Pennsylvania, by Union and Confederate forces during the American Civil War.
Relevant evidence: Yes