Which battle is known for Grant's army barely surviving a surprise attack?

The Battle of Shiloh, which took place on April 6-7, 1862, is particularly noted for its shocking and unexpected nature. Grant's Union forces were taken by surprise during the first day's fighting when Confederate troops launched a sudden attack. Initially, Grant's soldiers were unprepared, and the Confederate offensive caught them off guard, leading to significant early losses. However, despite the surprise and the difficult situation, Grant managed to hold his lines and, after reinforcements arrived, mounted a counterattack on the second day, ultimately leading to a Union victory. The battle underscored the chaotic nature of war and the importance of preparedness, as well as showcasing Grant's determination and leadership amidst adversity. This event was crucial in establishing Grant's reputation as a commanding general during the Civil War.