They need to get to the country before the demons arrive there, if they send people to stall for time they'll save more people than have 10 people try to catch 2 Demons. It's not about saving Armed forces heading towards battle, but to catch demons before they run away or kill people. And dont tell me the demons are too powerful that'd be even more bs.
A fool, a fool! I met a fool i' the forest, A motley fool; a miserable world! As I do live by food, I met a fool Who laid him down and bask'd him in the sun, And rail'd on Lady Fortune in good terms, In good set terms and yet a motley fool.