Higher Morales for Wu:
When you form a army with Sun Ce, Sun Shang Xiang, Sun Quan you will get a boost of 10 morale.
Morale Boosts For Wei Generals:
When forming an army, put Xiahou Dun, Xiahou Yuan, Cao Ren, and Cao Hong into the same unit. At the start of battle a dialogue will intiate with the four and each will receive a morale boost of 10. Keep these generals in the same unit for this to repeat every battle.
