Yes, this mission is interesting and challenging, but also quite confusing!
1. I don't understand why one of the missions failed. My Irina followed the Path of Tears and failed the mission "do not capture cities" after completing the task "clear the lighthouse of demons." And where is the logic in that? When the offended guardian asked for help, my Irina was offered a choice: attack (Path of Blood) or complete the task (Path of Tears). I naturally chose the Path of Tears, and as soon as I cleared the lighthouse, the castle switched sides, and my peacekeeping mission failed! That's how you help those in need.
And for some reason, I don't see the smile32 emoticon.
As for the troops, that's a rhetorical question. And regarding reinforcements, just look for the vortex in the far south of the map.