I haven’t read this yet but it looks interesting...
Benedict Arnold and The Battle of Saratoga: An examination of the role of Benedict Arnold during the Battle of Saratoga on September 19, 1777:
http://www.earlyamerica.com/review/2003_winter_spring/arnold_saratoga.htm
Without Arnold on that day, we very well could have lost that battle. His bravery was legendary...