Is it just me or is Hellheim troops way to strong?

[Reay]

Successful arrow hits dispel glamour? I thought they had to damage the unit to dispel glamour? Even if the arrow hits it might hit the shield or the units protection might be high, especially if they are earth blessed.

Tramples with Mammoths can get rid of glamour but you are only likely to cause 1 damage since their defense is so high.

So other than area affect spells what can work against Helherdlings?