After Vanessa's arrival and her being a witness to the whole situation, Wilhelm decided to blame the knights for using force against their allies.
That decision alone made the knights feel extremely bitter and angry at the noble.
`He was the one who cut down our people! How are we getting blamed and not this outsider!?´ They thought in unison.
Of course, such thoughts were only internally and not spoken out loud, especially in the presence of the Necromancer.
To them and the army, finding trouble with mercenaries was pretty common. As usual, they held a higher status than some hired killers.
Most of them followed their respective commanders who were both experienced soldiers and of nobility, making a social circle around the military.
Those 200 knights were actually being lent to Wilhelm for the sake of repairing a favor in the future towards the commander they were following.