Chamberlain was significant for a number of reasons. One of the more obscure is that he is considered the last man to die from wounds received in the Civil War. He died in 1914 (not 1913) and his death was attributed to his wound at Petersburg.
Hancock was another who never recovered from his wound, even though he became governor of PA. Don't know if it's true, but I read a fictional account of how they found the leather and fabric that was still inside his body that was killing him, saying a doctor designed a sling that worked like a saddle so that when they put Hancock in it, they could probe in the direction that he would have been sitting when he was in the saddle at Gettysburg.