More than welcome.
For a bit more background, the German immigrant community in and around St. Louis was strongly pro union, thus it is not out of the ordinary to find William H. Krause in the Union army. I encourage you to read about the Civil war in and around St. Louis as there are a number of good sources on the web with authors that contribute and support this forum.
I realize I may have left out a tidbit of info when I re-read my earlier post. The smallpox hospital on Arsenal Island had its own cemetery, however due to river flooding washing markers away and fear of losing bodies and graves into the river, 470 union and confederate veterns were reinterred at Jefferson Barracks National Cemetery. Due to the loss of markers on Arsenal island many of the reinternments are listed as unkown. I suspect that there is good probablity that William Hiram Krause is buried at Jefferson Barracks as an unkown and may very will have died of small pox. The last is speculation but a number of men from his regiment and company seem to have had the affliction and died at the same time thus it is certainly possible.
As for Pinkney I suspect he died in a Union prison/jail as Rolla was a significant post for the Union and to the best of my knowledge remained so through the war. Most Confederate/Southern/Seccesionist prisoners were transported to the nearsest significant Union base and then transported by train or wagon to prisons in the St. Louis area, some eventualy being exchanged, many escaped, and many died of disease and malnutrition. I'll see what I can find on Pinkney for you.