Which two generals was the key factor in the Confederates military success in the east?

The two key Confederate generals who significantly contributed to military success in the Eastern Theater of the American Civil War were Robert E. Lee and Stonewall Jackson. Lee's leadership and strategic acumen were pivotal in multiple victories, including the Second Battle of Bull Run and the Battle of Chancellorsville. Jackson's tactical brilliance and aggressive maneuvers complemented Lee's strategies, particularly during the Valley Campaign and at Chancellorsville, where his flank attack proved decisive. Together, they formed a formidable command that helped the Confederates achieve notable successes in the East.