Walkthrough tips, Discussion of Campaigns [Heroes 5]

I'm still playing a single-player map as Necromancers... it's called "Refugee" or something like that. I've already raised about 7,000 skeletons, but I haven't won yet. I made two mistakes: 1. I only leveled up one hero (thinking I could get away with it). 2. I spent a long time looking for swordsmen who could join me. There weren't any, so I have to recruit 20 at a time each week from the "Barracks" (I have two barracks). I've recruited 30 swordsmen so far, and I need 70 more to be happy.