The General had personal problems:
Born to a wealthy family in New York City, Sickles was involved in a number of public scandals, most notably the killing of his wife's lover, Philip Barton Key II, son of Francis Scott Key. He was acquitted after using temporary insanity as a legal defense for the first time in United States history. This became a defense associated with 'crimes of passion'.
Do not piss your neighbor off!!
He also had health and competency issues:
His military career ended at the Battle of Gettysburg in July 1863, after he moved his III Corps (without orders) to an untenable position where it was virtually destroyed. He was wounded by cannon fire and had to have his leg amputated.
Do not take any military advice from your neighbor!