Treaty of Paris: The Treaty of Paris marked the major victory for American colonists in their fight for independence from Great Britain by officially ending the Revolutionary War.
Battle of Gettysburg: The Battle of Gettysburg is considered a major victory for the Union during the Civil War as it halted General Lee's invasion into Northern territory.
D-Day: D-Day, also known as Operation Overlord, was a major Allied victory during World War II when they successfully invaded Normandy and began pushing back against Nazi Germany.