In all the talk of graphical downgrades no one seems much preoccupied with 'why?'. Why build something and then proceed to tear it down, piece by piece, in the hope that ever more diminished expectations about the final product won't be severe enough to...
Aim for experienced enemies first with your artillery to soften them up.
Charge an inexperienced unit with your cavalry and you might make them flee.
Send your general to your most immediately effective unit to boost its morale.