The roll you saw was the one you needed. That is, unless you really want to know the names of every Confederate captured at Island Ten. If you are interested in what's in the McDuffie service record for Walker's 5th Confederate, I may be able to locate that on microfilm. Let me know if that's of interest to you.

Here are some other sites which mention the "Morton Confederates":

http://www.norfield-publishing.com/flabook/fsicw.html
http://www.tngennet.org/civilwar/csainf/csa40.html
http://www.tngennet.org/civilwar/csainf/csa42.html