But I don't have many troops, I have generally one hero and one battalion. I don't have fortress either. I think problem is that AI is rushing in the beginning of the game to destroy me, but when I kill their heroes, they just give up. Same strategy works when they are very strong, in one game, Isengard and Misty Mountains attacked with Saruman, Smaug and one more hero at the beginning of the game and I was defeated I could even complete construction of my fortress. But in this situation, it is not possible to play long campaigns that I will produce many kinds of units.
By the way, almost all maps I played in War of the Ring has many random archer units attacking both me and AI. I think there are too many of them. Once they just destroyed my fortress construction in the beginning of the game and I wasted 5000 money. May be, AI is also suffering from same problem.
So, for the moment, you say war of the ring campaign is unplayable due to this problem ? Would AI be more clever if I increase the difficulty to brutal ?