On an open battlefield against archers the Guards' lack of a shield is a distinct disadvantage. Vaegir infantry can spawn with a variety of weapons and a high rate of two handers, at the cost of some spawning without shields. Vaegir Archers and Marksmen don't have the sheer power of the Rhodok Crossbowmen, but their bows feature a much higher rate of fire due to their much faster reloading. Where the Vaegirs really shine is their archers and maneuverability.
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However, they cannot match the armored fury of the Swadian Knights, nor the infantry steamroller of the Nords. The Vaegirs field a relatively balanced force, with their troop tree being similar in setup to the Swadians. Yours is a balanced troop tree exploit your enemies' specialization. Use stationary forces of archers and infantry to prevent the Khergits from taking your castles and their villages away from you. Cavalry raids on Nordic villages can stay out of reach of retribution while denying their jarls the funds to support large armies. Naturally, try to limit yourself to one war at a time, but since it only takes one to make a war, this isn't always possible.
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However, expect both tough siege battles against the powerful Nordic infantry and quick raids behind your lines by Khergit cavalry. Swadia is usually under attack from all sides, so attacks from that direction are often small and infrequent. The Vaegirs start off bordering the Nords to the west, Swadia to the south-west and the Khergits to the south.