The Word for World is Forest (Hainish Cycle, #5)

by Ursula K. Le Guin

You can’t disable a guerrilla type structure with bombs, it’s been proved, in fact my own part of the world where I was born proved it for about thirty years fighting off major super-powers one after the other in the twentieth century.

Maybe after I die people will be as they were before I was born, and before you came. But I do not think they will.”