I just stopped in to say I might do this going forward as a sort of royal guard. and keep them as whatever unit they were when they did there battlefield heroics I typically do the opposite. And purposely send in the same division into every war as a sort of elite unit like certain special forces units or something. As a sort of source of prestige to my military on the war front. And if I'm a warring civ like Mongolia I tend to keep the general in the front with that unit like a sort of king.