In his centennial history of the Civil War, Never Call Retreat, Catton titles his chapter on Chancellorsville, "The Darkness, and Jackson, and Fear".
In looking for the causes of the loss of Chancellorsville, the primary ones were that Hooker expected Lee to fall back without risking battle. Finding himself mistaken he assumed the defensive, and was outgeneraled and became demoralized by the superior tactical boldness of the enemy.Here is a wealth of study links
The map below shows troop dispositions at the final stages of the battle when Hooker (blue) planned his retreat back across the river in defeat. Those of you interested in military tactics and strategy may see here signs of the moral dominance Lee held over Hooker. What does this map tell you?
What would Lee have done here if he commanded the blue formations instead of the red? What would you have done with the two Corps of Reynolds and Howard?
Stephen Crane's book, The Red Badge of Courage is based on this battle.
Soldiering:The Civil War Diary of Rice C. Bull
A soldier's account: "Among the rank and file of largely uneducated Union Soldiers in the Civil War, Sergeant Rice C. Bull was an exception--a sensitive and perceptive man whose diary vividly describes the training, daily routine and combat that was the life of an infantryman. Among the memorable passages are those of the Battle of Chancellorsville and of marching with Sherman through a devastated Georgia to the sea."
Review of this book:
Rice Bull's regiment: 123rd New York
West Point study of the Battle of Chancellorsville Quick View of this study
From Student of the American Civil War: The Chancellorsville Campaign