It´s not just having full Command rating.... It´s also morale and situations, you don´t need to get your general more than 8, then you get Night Fighter and with enough night fighting you get Night owl or Likes Dark (total +2 on nights) and also attacking / defending. If born with 1-2* it will be unbelivibly hard to get it full, specially if you want truly chivalrious general (Fine With Blood and such give +dread) and get generals to town until they start to drink a bit or hope they start with Sober or Abhors Drink (at one point almost every family member of mine was Sober...) kills morale but give command and personal security.