The correct answer is Battle of Gettysburg
During the United States' secession war, the Battle of Gettysburg was the turning point in the fortunes of the war. After an unforeseen victory by the northern forces (union), the confederate states went on to a defensive war that led to defeat. The battle was immortalized by the heroism of soldiers and units on both sides, reaching immortality in American and military history, and to this day it is the biggest battle on the American continent.
