Dan Sickles took his leg with him to Washington when he was evacuated after the battle of Gettysburg, and gave it to a group of Army docs who were studying battle wounds. The leg was preserved, and for years after the war he visited his own leg in a museum in DC, and the leg still exists.
In spite of his battlefield screw-up, he wound up bewitching Congress into giving him a medal, and in the 1880s, he established the commission that turned Gettysburg into a national park.
Other little known fact—in 1890, he was elected Sheriff of NYC.
One of the most colorful characters in American history. If he was alive, he would agree.
Years after the battle he was instrumental in his efforts to preserve the battlefield at Gettysburg.