In April 1862 @ Pittsburgh Landing Tenn, early in the morning. A confederate force hit a union force that was in camp and surprise them in a day long fight that nearly defeated the union troops. By the end of the day no one had won the the fight.
However the next day the union was able to bring in reinforcedment and was able to drive the confederate from the field. After the battle of shiloh it was said that the south never smiled again