The Union continued to fight. They fought throughout the entire day.
General George McClellan was wrong about Lee having reserves, for he had forgotten that the South had a major disadvantage in population.
In just a day, The Union won this bloody battle, but at a great cost. In total, 23,000 people were killed. Despite General George McClellan’s enormous blunder in thinking Lee had reserves, this victory was very important for the North. Lee’s advance into the North had been stopped.