Even if the dice were 'skewed', military tactics call for any war/battle to be fought only when you have 3:1 military superiority. If this is not possible, achieve a victory by surprise or superior positioning. If THIS is not possible (in the case of a defensive war/battle, use politics or retreat to fight another day. Or do what the enemy does not expect (sometimes this involves attacking their capital while their 'doomstack' is busy elsewhere.