Why was the union defeated in the east?

The Union faced several challenges in the East, including strategic miscalculations, underestimating Confederate leadership like General Robert E. Lee, and logistical difficulties. Key battles, such as the Second Battle of Bull Run and the Battle of Fredericksburg, resulted in significant losses and diminished morale. Additionally, the Confederacy's ability to leverage its knowledge of the terrain and employ effective defensive tactics contributed to the Union's struggles in this region. Ultimately, these factors combined to hinder Union advances and prolong the conflict.