This is my favorite battle of the Civil War, Lee had an army of about 55,000 compared to the Union army under Hooker with 130,000 and old Bobbie Lee was still able to beat the much larger force. The only thing bad which came from this battle was the death of Stonewall Jackson, the spirit of the south, without him the Army of Northern Virginia was no longer invincible. Back to the battle
It was Lee's greatest victory and a masterpiece of two great minds. If you want to learn more check out the book "Chancellorsville" by Stephen Sears.