he Battle of Chancellorsville was a major battle of the American Civil War and the principal engagement of the Chancellorsville Campaign.4 It was fought from April 30 to May 6 1863 in Spotsylvania County Virginia near the village of Chancellorsville. Two related battles were fought nearby on May 3 in the vicinity of Fredericksburg. The campaign pitted Union Army Maj. Gen. Joseph Hooker's Army of the Potomac against an army less than half its size Gen. Robert E. Lee's Confederate Army of Northern Virginia. Chancellorsville is known as Lee's "perfect battle" because his risky decision to divide his army in the presence of a much larger enemy force resulted in a significant Confederate victory. The victory a product of Lee's audacity and Hooker's timid decision making was tempered by heavy casualties and the mortal wounding of Lt. Gen. Thomas J. "Stonewall" Jackson to friendly fire a loss that Lee likened to "losing my right arm."