The Union general responsible for the cavalry corps at Gettysburg was John Buford.

As a key leader of the Union cavalry, Buford played a critical role in the early stages of the battle. Arriving in Gettysburg before the main forces, he quickly recognized the importance of the high ground. Buford's cavalry engaged Confederate troops, collecting essential intelligence and delaying their advance until the Union infantry could arrive. His strategic acumen and adept use of cavalry were pivotal in laying the groundwork for the Union's defensive success in the battle.