"The Art of Strategy"

and in almost every battle, you'll suffer losses – if you're lucky, you'll lose fewer than 30 shields in a week – and for Ingvar, that's his main stack. Plus, you still won't be able to tackle even the highest-level Dwarf Fortress with such units. I won't even mention Elementals and the like. And breaking through to the center and killing something significant with just a handful of shields is unlikely to succeed. As a result, if there isn't a significant advantage, there will be a lag in resources, level, and gold because you'll have to choose who to fight.