The National Parks Civil War Soldiers and Sailors list shows a 1st Lt. Manius D, Burgher in Company "A" of the 3rd Missouri Infantry. (Not State Guard)

It is possible that "Manius" and "Marion" are the same person in Company "A" of the 3rd Missouri Inf. and that we are dealing with a transcription scribners error in one of these Records. Since you, in your original inquiry, only provided Lt. M.D. Burgher as a name for your uncle, it is possible that neither of these two names are for your Uncle.