A key reason for Lee's invasion of the North was to demoralize the North.

By taking the fight to Union territory, Lee aimed to undermine Northern morale and demonstrate that the Confederacy could win significant victories on their soil. This strategy sought to pressure the Union into peace negotiations by showcasing Confederate strength. Additionally, while securing resources and drawing Union forces away from Richmond were also factors, the primary goal was to strike a psychological blow that would weaken the resolve of the Northern populace and leadership.