Maretti
When he fight with computer, which has hero not in town with 7 slots army+ 1 slot(zombie) in town, he used armageddon and fire elementals and won a battle but he didnt take a town because of this extra slot of zombies
@Noom and Diabler: Thanks for answering.
If you only have summoned units left you dont win the battle, so even if the town was empty after the battle he wouldnt get it.