Pendor troops are great on the defensive. Believe it or not, I beat Eyegrim *and* the Three Seers using only Pendor common troops with non-knighthood noble cavalry. Pendor regular armor is far better than it looks -they can take hail after hail of arrows even without shields and still survive to engage in melee. Keep them on the defensive and have the archers in a tight wall in front of the infantry, forming a new front rank, and have your cavalry intercept the enemy cavalry as they charge or move behind their infantry to get them to turn their shields around.
The archers while not the best, can skirmish with the best, while punishing melee infantry hardcore, and they're so cheap that they can act as a free buffer against cavalry and infantry charges and not be missed. When their arrows are gone, they make decent bastard sword infantry too. Don't fear the red text crossing the screen, look forward to the message confirming your reinforcements.