Running this mission with average gears can be hard, but it's easier if you have a mass DEF debuffer like Cannon Main here. Debuff, kill, move forward, repeat your way to victory.
This is one of the easier and faster Dogon missions. Was a lot easier before the Three Gateways patch but still very doable with average gear (+4 evil weapons type average). No bosses to kill. Kill all mobs as you move north and destroy 4 buildings (prisons) to complete the mission.
Stalling NPCs with a stunner like Sheriff, Druid or Ody would give you extra turns to kill mobs here. Add a Hwarang to turn your Cata into a decent damage dealer, which is also very useful for wiping the final ambush in 1 turn.
Cannon mains shine in this TBS although other mains can do it too with either a Sheriff or Cannoneer plus either Hwarang or Healer for those with lower + support weapons like I have here since you'd definitely need more 1 hitting power in this mission.
This mission could be hard if you follow the preset mission sequence, but by clearing mobs in advance before accomplishing objectives it doesn't have to be.
I wouldn't recommend soloing this mission if you can't kill Dogon bosses within 4 turns at most. But if you can, then there should be no problem.
This is the only mission I take the Cannoneer to and he works great here with his very wide range and ability to hit over obstacles. Any main can solo this with a good Cannoneer and Hwarang.