Demon invasion.

Yeah... I can't seem to beat the second mission. I failed during the second invasion; Bertrand arrived with an even larger army, and after the first battle, I was left with 101 succubi and 1 cave lurker. I just don't have enough time to rebuild my forces (((.

Added 15 minutes later
P.S. By the way, why do creatures only have one upgrade? In my opinion, cave lords are better than cave lurkers, or is that intentional?!