ID are indeed the most dangerous due to their initiative and speed. And if you're playing with Winghelm, they are guaranteed to go twice, before the first high-level units of the opponent. And that really means death for archers. But having any other 7th-level unit attack them is suicide (unless it's a sworn enemy)... And even after they go to bomb the archers, they die like flies.
Considering that:
1) they will most likely attack with luck (only the lazy don't boost luck in Sylvan).
2) the "