In war, the morale of your soilders can often have a great effect on the battle, so be sure to keep the moral high and in your favour! In battle, whenever you damage the enemy, their bar will decrease while yours increases (The same thing goes for them if they attack you, yours will decrease, theirs will increase) Depending on how high the bar is, that team will gain bonuses, like attributes upon attack, or stat buffs, or even immunity to death for a couple of turns, should you raise the bar high enough! Be sure to act wisely in battle.

(See newest screenshot on game page)