I think I'll allow it to be an Ubermeister, a man of high military rank, but still below the rank of sitting in High Command. He will be guarded by two men of the Kreuzfahrer corps, they are basically the strongest soldiers you'll see outside of the borders of the Union, nothing more. Keep in mind that either they arrived via train (most likely) and then it would be heavily armored and armed, because they don't trust their neighbors, or it would be via the use of a battleship, which isn't as likely. OR it could just be a transport sent from your nation, most probably one that wasn't traveling via air since the Unions AA net is undiscriminating.