Hooker, too, proved unable to defeat Lee's army; despite having more than twice as many troops as Lee, Hooker's Chancellorsville Campaign proved ineffective, and he was soundly defeated in the Battle of Chancellorsville, which was fought between April 30 and May 6, 1863. Chancellorsville is known as Lee's "perfect battle" because his risky decision to divide his army paid off. During the Battle of Chancellorsville, Stonewall Jackson was shot in his left arm and right hand by friendly fire, leading to the amputation of his arm, and he died of pneumonia. Lee famously said: "He has lost his left arm, but I have lost my right arm."