Question: Which battle occurred first, the Battle of Cold Harbor or Operation Diadem?
Sentence (from "Battle of Gaines's Mill"): The Battle of Gaines's Mill, sometimes known as the First Battle of Cold Harbor or the Battle of Chickahominy River, took place on June 27, 1862, in Hanover County, Virginia, as the third of the Seven Days Battles (Peninsula Campaign) of the American Civil War.
Relevant evidence: No