Bill, all of my known ancestors - at least a dozen - wore gray and served in the Confederate Infantry, Cavalry and Artillery. One was in an artillery unit along the Jerusalem Church Road when the mine was blown under the Confederate positions at Petersburg, creating the infamous "Crater". The First Nelson Light Artillery was equiped with Coehorn mortars and they did the Devil's work that day. That particular ancestor was at Appomattox Court House when Lee surrendered on 9 April, 1865. Lee's forces numbered only 28,000 by then.
Your ancestor sounds like a brave man. Many CMH's were awarded for capturing the enemy's colors. I have a copy of the 128 volume "The Official Record of the War of the Rebellion" - known better as the "Official Record" or "OR" - on CD and will see what I can find about your ancestor. As a winner of the CMH, he'll be mentioned in official documents, no doubt. I'll let you know what I find.
Walker