Your magic resistance got nerfed in the third game to only resist magical spells.
Frankly, your units will hold out forever. Additionally, with their naturally high leadership, dwarfs do not usually break unless hopelessly outnumbered or if you screw up massively by getting cavalry charged in the rear. This is further supplemented by the innate magic resist many of your units have, which slightly compensates for your otherwise complete lack of magic. Even your tier one and chaff are very tanky compared to counterparts from other factions. Most of your units are categorized with high armour, melee defense and leadership.
