Hello Gregory, The Confederate Powder Works in Augusta had ceased to exist as of April 18, 1865 thus implying to me the city of Augusta was only a few days away from Union occupation.

Union General Geary briefly acted as the city of Savannah military governor in January of 1865 and he may have chosen the Provost Marshall for Savannah after he left with Sherman. I am assuming that it was the Provost Marshall of Savannah who may have issued the decree.

Using google enter "books" and then type in "Savannah citizens exiled 1865" There is a short paragraph about your subject in the book. "Parole, Pardon, Pass and Amnesty Documents of the Civil War"

Briefly the Provost Marshall of Savannah invited citizens to take the loyalty oath and they were given a certificate. Some local business men lead the way in doing this so they could continue to operate. Citizens who harassed loyal Union citizens as the Union looked at them were exiled. It would not surprise me to learn the some citizens who had Confederate officers within their family also were exiled as you said.

As I'm sure you are aware Augusta was the 2nd largest city in Georgia during the war. Perhaps there may be some additional information on your subject matter in those papers?

I'll share a quick story that was on PBS in Georgia a few weeks ago. General Howard who had lost an arm sort of invited himself to dine with a Southern family in Savannah during Sherman's occupation. A little girl ask General Howard how he had lost his arm? General Howard replied a rebel shot me. And with that the little girl said I bet it was my father because he is a good shot. The little girl was Juliette Gordon Low who had been born in 1860 and would later be the founder of the Girl Scouts.