Having trouble with objective to destroy 2 Wotan with Stark mechs. Read in another thread that they would start spawning and regularly raiding your base after the side gate is opened and you regain control of your troops.

I have spent hours waiting around but all I see are primarily Grimbarts and very very rarely, some other mech. Have never seen a single Wotan in this mission.

Any tip/trick to this, or do I just have to waste more time and pray a Wotan spawns?

Seriously, the mission design...