A kind of thought ray has a world locked up in deadly battle with the human colonizers.
The basic theme of Harry Harrison’s Deathworld (1960) has not lost its relevance, and the novel makes for a good reread, and although not great literature, it is up from e g his Stainless steel character. The man gambles but he also thinks and feels. Very interesting concerning the period development in science fiction. Camouflaged as science fiction, we get a critique of military logic, and a sketch of another form of society. Not bad, even if some of the writing is poor. I found Deathworld while going through my SF library, to rediscover, and enjoy.