@Kyujyu he used the pretext of being the last line in defense incase the army failed to contain the invader.
This allowed him to hole up, to so to speak, by protecting his forces in a last ditch push incase the enemy broke the line.
In reality he didnt do squat because he made a deal with king ferme, so it he was honestly in a win win situation should king ferme have won.
He was to march his army and they would drink some wine, and Ferme would just leave after that.
But then came Almus who ground stomped that path, and pulled a great Gandolf by saying you shall not pass.