mmmm, not sure if it applies, but in Total War games I tend to chase running enemies with cavalry just because. There is no real strategic value, but if they dared oppose me they might as well suffer!!
I tend to be just as ruthless with my own troops, sending units to lure enemies, knowing perfectly well that they are all dead men.
Similar situation in Mount and Blade Warband, I have started wars just to annoy the king I was serving at the moment, then switch sides to another faction, and attack my previous king on two fronts, killing peasants and destroying everything in my path.
I tend to be just as ruthless with my own troops, sending units to lure enemies, knowing perfectly well that they are all dead men.
Similar situation in Mount and Blade Warband, I have started wars just to annoy the king I was serving at the moment, then switch sides to another faction, and attack my previous king on two fronts, killing peasants and destroying everything in my path.