You 're out of luck with a neighbor, he was quarrelsome and aggressive, so diligently to strengthen and prepare for an attack. Build buildings and structures that can prepare archers and knights, the forge, farm and other useful at home to ensure the army needed weapons and food. Thoroughly entrenched, organize raids on the enemy castle, not give him time to recover, to conquer new territories. Upgrade your existing construction to inventories of resources and people to perform faster.