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I took the easiest path :)
I hardly had to generate anything. The only thing I had to generate was the actions of the orange sorceress. I adjusted her moves so that by the time my hero appeared, her heroes were not in the Castle, and so that she wouldn't attack me along the way.
I'll tell you briefly because I don't feel like writing a full Walkthrough :):
On the first day, I bought two barbarians and collected resources.
On the second day, I continued to collect resources (I took a bag of gold), bought two more heroes (a barbarian and a warlock), built wolves, and upgraded archers.
On the third day, I was still collecting resources, built ogres in the Castle, and sent one hero (a barbarian) through the swamps towards the sorceress.
On the 4th day (at the very beginning), I went to the market, exchanged resources for stones, and ran back - everyone is retreating to the starting Castle (except for one hero who is clearing out boars and continues to run towards the sorceress).
On the 5th day, I placed trolls; there were 3 of them - each hero got a troll + some minor units. The heroes start moving towards the remaining enemies.
On the 6th day, the campaign continues.
On the 7th day, I captured the sorceress's Castle and settled in.
On the 8th day, I captured the remaining Castles, sent out new heroes from all the Castles with fresh troops, and defeated the enemy heroes. However, the knight and necromancer's heroes ran away too far, and I couldn't reach them :(, and I didn't feel like replaying 5 turns :). Therefore, I moved to a safe distance (so that they wouldn't attack me during their turn) and spent the entire 9th day gathering skills.
That's how easy it was :rolleyes: