Wulfsten's Challenge - "Laslo" [Campaign 2, Mission 5]

I did it like this: the first time, he met me when I was heading towards the green area, with a considerable army. I tried various tactics, but nothing worked. The second time, after gathering enough troops to take out the garrison and finding the Tear (I already knew where it was), I went to meet Laslo, hoping I could get away with it. - And I did! ))) He rushed towards the second castle, but I didn't chase him; instead, I captured Horknest. (Meanwhile, my allies were clearing out the upper areas and bringing troops to the lower dwarven garrison). Laslo couldn't stand it and came to kick me out of Horknest. I quickly slipped past him (Horknest was empty - he rushed in there), and I captured the second town. He got upset and, after capturing Horknest, didn't venture out of there anymore. And after that, it was just a matter of technique.