Why was Jackson important during the civil war?

He was part of the confederacy. Plus, Jackson distinguished himself at the Battle of Bull Run at Manassas in July 1861, when he inflicted a crushing defeat on the Union Army. The bravery was such that General Bernard E. Bee, commander of the South Carolina Confederacy, cried out to his men to look to Jackson, stating: "There he stands like a stone wall. Rally behind the Virginians". Bee, Jackson's classmate from West Point, died in the battle, but the "Stonewall" tribute became a legend.