Why was Shiloh considered a confederate defeat?

The Battle of Shiloh, fought in April 1862, is often considered a Confederate defeat due to the heavy casualties they suffered and the strategic outcome of the engagement. Despite initially gaining the upper hand and pushing Union forces back, the Confederates were unable to secure a decisive victory. The arrival of Union reinforcements the following day turned the tide, leading to a Confederate withdrawal. Ultimately, the battle marked a significant setback for the Confederacy, as it opened the way for Union advances into the South.