In the time period being discussed, concerning the orders of General Milroy (c 1864), was after the institution of General Order No. 100 - aka the Lieber Codes. Those superceded, and in part, included, the earlier Articles of War dating back to the first ones adopted by the United States in the Revolutionary period.
the Law of War CANNOT be set aside by any power.
free dixie,sw
Yeah, and even your beloved Lieber Codes say that torturing people and executing civilians without some kind of charge against them are forbidden. Of course you would prefer that we think otherwise, hence your willful removal of those clauses from the excerpts of it that you posted.