Nathan...
I've not had a chance to go searching for the book you suggested but I will. In the meantime I recalled a list of Nashville hospitals that I had copied from a newspaper of August 1864, but had put aside and forgotten when I found the account of my gggf's murder. This list says Cumberland Hopsital was on Hardin(g) Pike. Piecing together several maps of varying scales and detail it appears that Broad St. became Hardin Pike as it went out into the countryside. Also... some reasonable speculation on my part is that Camp Donaldson may well have been the encampment of the Army of the Cumberland Quartermaster, General J. Donaldson. The pieces start to come together in that the locations seem to coincide, as does my gggf's units, both the 125th Illinois and the 15th USCT, which did guard duty for the railroads and supply trains.

I didn't mean to make this so long, but it is always exciting to finally put together pieces of a puzzle. I am a family genealogist, just getting my nose into the Civil War as it relates to my gggf.