I think Jrad has a good idea but, would a 4/4/1 unit be considered offensive? I mean attack and defense are equal, so it might still be seen as a defensive unit, especially since it has a move of 1 and a UU can only be had by one civ anyway. I agree that in General swordmen should get upgraded- probably to riflemen once Nationalism comes (same attack). If not, for lots of money to Marines (offensive infantry).
Still, 4/4/1, while a big jump from 2/4/1 musketmen, sounds very good since Tercios were excellent both at attack and defense.