Necromancers – “Assault” [Campaign 3, Mission 2]

When playing as Necropolis, you have a great opportunity to gather all your troops into one force. So, use it! Send Godric (and then Izabella) to the first available Sanctuary, the humans to the Temple of the Underworld, and then to Marcella. A combined army will be stronger than two equal armies in terms of monster count. Then, wipe them all out with Marcella. This tactic has never failed me. The main thing is to hide the scenario hero from Haven, so you don't have to worry about him. Oh yes, the sea patrol of mages doesn't venture far inland.