The Children Of The Forest are, essentially, a group of children who became stranded at a scout camp when the war started, and never really got a chance to grow up.
Raised by their camp master, who they call "Teacher", they have adapted to survive in the wilderness against all threats. Be that the changing weather, fierce creatures, bandit attacks or unwelcome guests.
Being cut off from civilization is a real challenge to your ability to survive. It's not just the local wildlife and natural hazards that might kill you, but also the lack of resources. Ammunition and supplies are not easy to find here.