[Wauthan]

As long as you present a "bait" province, the AI will prefer to attack it above any else. This means you can use a mix of indepentants and provincial defence to funnel C'Tis into a position where you can attack his force as well as cut off his retreat. The lizards have a lot of trouble standing up against Marignons heavy troops and crossbows. So if you can get a small, no more than two commanders and 40 units perhaps, but determined force advancing into his territory you should be able to divert the attention away from yourself.

Since you got Ermor next door I recommend massing cheap priests, around 20 will do fine, and plow right into him. Ermor will pretty soon be able to overtake arcosephale so presenting a diVersion might distract them long enough for you to deal with the lizards.