Miles, There would be some overlapping among those men listed as joining the 3rd Maryland, galvanized, deserters, and taking the oath. For example, all of those who joined the 3rd Maryland or became other Galvanized Yankees would have been required to take the oath of allegiance. Plus, I'm sure some of the deserters did as well and it was fairly common for pows to take the oath as a way of getting out of prison. So the total number would be considerably less than 163.