What lesson about victory did Grant learn at Shiloh?

At the Battle of Shiloh, Ulysses S. Grant learned that victory in war requires not only tactical skill but also the ability to adapt to unexpected circumstances. Despite facing fierce resistance and initial setbacks, Grant's resolve and determination to regroup and counterattack ultimately led to a hard-fought Union victory. This experience taught him the importance of resilience and the necessity of maintaining a strong offensive posture, even in the face of adversity.