I`ve attacked one of Magnar cities with 4 heroes. All of my heroes got around 10 attack and 0-3 defense. Magnar forces (4 defenders, no heroes) got 10 attack and 3 defense. All of my units got possibility to do 0-0 damage. When i`ve hit one of Magnar units there were written that he "resisted" attack. I thought that resist work only for spells.