system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do massive, well supplied armies have such difficulty dealing with small, poorly equipped armies?

Why don't they just mow them down with continuous aggression, just annihilating them? 

Ex: Various terrorist groups, poachers in Africa, other rebellions etc.
gpt
A relatively small force is more maneuverable and can hide easier. Poachers and terrorists blend with the local populace, most of them actually *are* locals...they know the area better than the opposing force. Planning a full assault with a large military force is a logistical nightmare, an ambush at an intersection with five guys is easy by comparison.