Minimizing losses against archers

[Coffeejunk]

Hi all,

I just started out (lvl 7 now) and the mobs start to get a bit tougher.
Especially in the Swamp part, where I run into enemies with a couple of stack of 100+ skeleton archers.

When they start shooting, I start dying. And with the support mobs around them, sending griffins in is a bit painfull too...

Maybe I'm too concerned with losses (more then 10% of a stack is considerd way to much in my book..).

Two questions from this:
- What is an acceptable loss (number of units (% of stack))
- How do you deal with ranged attackers to minimize losses?

Thanks