No individual who fought at Gettysburg was more controversial, both personally and professionally, than Major General Daniel E. Sickles. By 1863, Sickles was notorious as a disgraced former Congressman who murdered his wife's lover on the streets of Washington and used America's first temporary insanity defense to escape justice. With his political career in ruins, Sickles used his connections with President Lincoln to obtain a prominent command in the Army of the Potomac's Third Corps-despite having no military experience. At Gettysburg, he openly disobeyed orders in one of the most controversial decisions in military history. No single action dictated the battlefield strategies of George Meade and Robert E. Lee more than Sickles' unauthorized advance to the Peach Orchard, and the mythic defense of Little Round Top might have occurred quite differently were it not for General Sickles. Fighting heroically, Sickles lost his leg on the field and thereafter worked to remove General Meade from command of the army. Sickles spent the remainder of his checkered life declaring himself the true hero of Gettysburg.