Reliable Redoubt gargoyle battle

[Kshahdoo]

So I play on Core difficulty, have a 7th level group and can't beat these ♥♥♥♥♥♥♥ gargoyles. Lost 4 times already. There are a lot of them, they come from different sides, use smite good, have a lot of attack, use spells like enervation, have a lot of hp etc. Can't do nothing to them.