I'm in year 404.
Dunland took out Rohan and half of RK, each turn a full stack of dunland troops attack in the east (town south of Lorien) these are easily held off by one general unit and 5 archer units with only 0-4 losses in the general and sometimes 1-2 losses to the archers from ranged weapons.
Not got any complaint about being able to win comfortably but I should take some attrition losses. I think the issue is that dunland troops don't have the attack capability to get through the generals armor.
Dale and Adunabar can get through the generals armor but even then they find it very hard work and any damage they do in one battle is healed by the next.