The description of Capt. Royall's wounds you are seeking is contained in "Across the Continent with the Fifth Cavalry," p. 295.

I am a newspaper reporter in Columbia, Mo., who compiles a daily Civil War history report for our newspaper.

Check it out at
http://www.columbiatribune.com/news/topics/civil-war/

Royall was from Columbia, and was unusual because he was a Regular Army officer who was not a West Point graduate. Things would get hot for the Fifth Cavalry 150 years ago this weekend.

Google has the book online as a free e-book. Here's the link:
http://books.google.com/books/about/Across_the_continent_with_the_Fifth_Cava.html?id=FGtGAAAAYAAJ