Tactics for the Swamp (Fortress).

The main hero should be Tazar, Crag Hack, Gundula, Dessa, Kirr, Zil, Galtran, Vidomina, Izra, Sir Mullich, or Bron, if he comes with enough basilisks. If none of these are available, Mephala, Neela, Gunnar, Kirr, or a specialist in ballistae will do.
In the first week, it is MANDATORY to build a wyvern tower. After that, depending on the situation, either switch to another castle or continue developing your current one.