How many casualties occurred at the Battle of Gettysburg?

The Battle of Gettysburg, fought from July 1–3, 1863, resulted in some of the heaviest casualties of the American Civil War. Total losses for the three-day engagement were approximately 51,000 soldiers.1

The breakdown of these casualties is as follows:

• Union (Army of the Potomac): Out of approximately 94,000 troops, there were about 23,000 casualties, including more than 3,100 killed.1
• Confederate (Army of Northern Virginia): Out of more than 71,000 troops, there were about 28,000 casualties, including some 3,900 killed.1

By the end of the first day of fighting alone, total casualties had already reached approximately 15,500 killed, wounded, captured, or missing.2