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Vikh, I don't know the race very well, but I started playing using this scheme: I chose a hero (I don't remember the name, he's a speed specialist). I won't break down what to capture day by day, but I'll tell you which monsters to take: imps and greater demons – they are a must, they are stronger due to the wider attack range...
Neutral clearing:
1) Open the gate with both units.
2) Wait, wait, wait...
3) Use the summoners: attack with imps, jump with demons.
4) Use the regular units: finish off with a large number of imps and a demon jump...
P.S.: If there are any losses, they are usually minimal, and often there are none. I didn't take hounds and others into account; these are the first steps for the demon lord...
P.P.S.: Well, you know about the game of tag with hounds, I'm sure of it; the main thing is to quickly take the "I'm taking a break" position. XDDDDDD