At the Battle of Chancellorsville, the Army of Northern Virginia was faced with a serious threat by the Army of the Potomac and its new commanding general, Major General Joseph Hooker. General Lee decided to employ a risky tactic to take the initiative and offensive away from Hooker's new southern thrust – he decided to divide his forces. Jackson and his entire corps went on an aggressive flanking maneuver to the right of the Union lines: this flanking movement would be one of the most successful and dramatic of the war. While riding with his infantry in a wide berth well south and west of the Federal line of battle, Jackson employed Maj. Gen. Fitzhugh Lee's cavalry to provide for better reconnaissance regarding the exact location of the Union right and rear. The results were far better than even Jackson could have hoped. Fitzhugh Lee found the entire right side of the Federal lines in the middle of open field, guarded merely by two guns that faced westward, as well as the supplies and rear encampments. The men were eating and playing games in carefree fashion, completely unaware that an entire Confederate corps was less than a mile away. What happened next is given in Fitzhugh Lee's own words: