I have a personal memoir from a Confederate I am working on. As a 16-year-old, he was living around a mile from the Battle of Mt. Zion Church battlefield, and described the fight, casualties, and aftermath. Here's what he said about one of the Confederate casualties--

"Several of the Confederate boys were wounded, but were all taken away, wounds cleaned, and they were cared for by the good people of that neighborhood. Clifton Quisenberry, who I have mentioned above, was taken to the home of Willis Elkin, whose wife was Clifton’s aunt, and was there nursed and cared for until death claimed him. His wound from the gunshot soon healed, but his fall from his horse to the frozen ground bruised his hips and legs so badly he never got well, and the poor fellow, with all that careful nursing could give, lived fully three months and then died from his bruises, and not from the bullet wound."

I have second independent eyewitness account of Quisenberry's death which also talks about him dying from severe bruising. This person surmised "blood poisoning."

Any readers with specialized knowledge (John?), care to venture a hypothesis 157 years after the fact?