Synopsis: While Mel Gibson's sprawling Scottish epic Braveheart earned plenty of accolades from moviegoers (and from Oscar), the film's loose portrayal of historical events wasn't as popular among well-read scholars. This installment of A&E's "History's Mysteries" series dissects the truth -- and myth -- surrounding the legendary William Wallace, from his victory against King Edward I at Falkirk to his eventual execution in 1305.