These will add large numbers to your Levy while also boosting the damage and toughness of archers and skirmishers which make up the cheaper of your Men-at-Arms and as such will be the early to mid game units of choice. Many buildings that increase your Levy also offer Realm-wide bonuses to the Men-at-Arms units that will be your heavy hitters. As with most things, it comes down to numbers and being able to marshal even an extra few hundred men early game makes a huge difference in who you can defeat.
Your next step should be increasing your personal Levies. Coincidentally some of these also happen to be the cheapest options which make them even better choices for the early game.
When fighting a defence battle these roll modifiers can turn defeat into victory, but if you were to only choose one, the Bailey offers much better benefits and remains viable well into late game. A good starting point may be to build a few Defender Advantage buildings such as the Outpost and Bailey. What you choose will be dependent on what you need most at the time, and all buildings can be replaced at a later date, although you do lose the initial investment.
