I believe the wound you're referring to was suffered at Petersburg in June 1864 where he was shot through the right hip and groin. The wound was expected to be fatal, but his pulled through. Still, Chamberlain was wounded 6 times during the war, and I'm sure any one of them caused problems later in his life.
Wow. Six times. Just one, and I’d be saying, “OK, did my part.”
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.