Mount&Blade/Vaegirs

The Vaegirs are a powerful faction, with good archers and cavalry as well as fairly strong infantry.

The differences between the Vaegirs and Swadians are somewhat aesthetic; while each his its own individual strengths (Vaegir Marksmen fire much faster than Swadian Sharpshooters) there are also some weaknesses that balance this out.

Combat strategies
As one of the two original factions, the Vaegirs have a more developed troop tree than any faction other than the Swadians. Vaegirs boast accurate archers and durable knights, but the correct use of a varied party is still the key to victory.

Against infantry
Archers are the key to victory against slow moving infantry, and will generally do well against all other troop types. The Achilles heel of Vaegir archers is their relatively poor armour at the early stages, so back them up with some infantry of cavalry of your own when the enemy infantry gets too close for comfort.

Against cavalry
Contrary to popular belief, spears are not necessarily the best weapon against horsemen. Cavalry forces are only effective against scattered individual troops on flat terrain. With infantry and archers, the best bet is to find high ground and bombard the horsemen with volleys of arrows and have the infantry close in with the enemy cavalry when the arrows are all used up or when the they get too close for comfort.

The key to winning against cavalry with infantry on open plains is to tightly pack them together. Remember, horsemen need momentum to be effective, deny them that with infantry surrounding them and they easily crumble.

When cavalry forces clash, it becomes a matter of who has a lance, who has the better armour, and who has the better luck.

Against archers
Archers are rightly feared on the battle field for their ability to cause casualties before the main forces engage. Fast moving cavalry, especially heavy cavalry (Vaegir Knights) will make quick work of these nuisances. In cases where cavalry is unavailable, the best option is to close as quickly as possible with your infantry and force the archers into an outright melee.