Taking the Necropolis.

Tip: If you can't destroy 5 or 10 Vampires in the Necropolis in one turn and there's a risk that Vampires or Witches will reach your "main stack" (e.g., 24 Heavy Crossbowmen and 33 Pikemen), position your Warriors so that neither Vampires nor Witches can reach them on their turn, and you'll have the opportunity to fire with the Crossbowmen and deal damage with the Pikemen. You can arrange your troops in the following order (from left to right): 1-28 (Pikemen)-1-1-1-1-24 (Crossbowmen).
On Necropolis maps, with this arrangement, neither Vampires nor Witches will be able to reach your 2nd, 5th, or 7th stack on their turn.