Fighting dragons tips

[bukimi]

I wonder how to fight dragons to avoid heavy losses.

They seem to run directly to the weak shoothing units and kill lots of beholders, inquisitors or whatever is the weakest unit.
Before they can be stopped they really do a lot of damage and my units also cannot shoot

I already have necklace from dragon teeth.
I think I dont have any more helpful artifacts in my current gameplay.

What units should I take?
I thought of temporarily fighting with only 2 stacks of demons if I find some or call Archdemons with scroll.
They deal physical damage and are resistant to fire at the same time...

Will be grateful for hints