I had Nanaly, Elizabeth, and several expendable rogues that I hoped would be fine for the mummies + scorps, but nope, somehow the latter still kept getting past.

That, and blind-dropping my Prince/one of my healers in the pegasus riders' path and my comp deciding, "nah, I think we won't register your next ten clicks as you frantically and fruitlessly try to hit the withdraw button" was what screwed me over.