Edward O. Grebe is listed as a lieutenant colonel in a Union volunteer regiment; the surname suggests German-American origin, common among Missouri and Midwestern German immigrant regiments of the period. Searches of Wikipedia, Find A Grave, and Civil War rosters found a similarly named Medal of Honor recipient, M. R. William Grebe of Missouri, but he does not match this individual’s first name or rank, and no other source could be confidently matched, so no verified details can be reported.