Ice and Fire

If that's the case, then it's unlikely that the map can be completed with a hero in the first version.

I'm telling you – the second caravan has just arrived. I took troops from it and, with skillful logistics and stables, rushed straight to the computer-controlled faction.
The computer-controlled faction has a monthly growth, meaning it has taken a full army from its castle.
This army can be easily defeated, if it weren't for the Chaos.
Here's how it's done:
We separate 2 stacks of 3 Imps each; we don't take Devils or Demons (they're not very effective anyway).
1. We place the first stack of 3 Imps opposite the Bears. They will attack them on the first turn and then be destroyed.
2. Next, the Dragons will fall. We place whatever we can spare against them so they don't use their special ability, and they will also be destroyed.
3. Then come the Skeletons. If they use their special ability, they will destroy 10-15 Horsemen. And they will also be destroyed. The main thing here is not to let the right stacks get caught by the Guardians.
4. The Guardians are defeated.
5. The Harpooners, who were previously blinded, charmed, and then caught in a Dispel, are finished off.
6. Finally, all together, we defeat the Jarls, who were standing under Blindness at the beginning of the battle.
That's the whole battle – minimal losses. Chaos, however, eliminates almost the entire army.