I am revisiting an older scenario I came up with, but I have been experiencing many of the same problems. I have a swampy, jungle world which flooded, causing a species of fire ant that made an ant raft to evolve a collective behavior, ditching anthills and becoming an ant-hill (I'm not sorry). Over thousands of years, the flood water receded and the clustering behavior of these ant-hills remained, creating a powerful, natural, biological army. Over many millions of years and some complicated evolutionary history, I don't have room to explain, These ant-hills evolved into a [collective consciousness](https://worldbuilding.stackexchange.com/questions/46962/what-would-a-collective-consciousness-look-like) complete with a military and hatred of local terraforming humans.

As they do not bleed and lack 'organs' so to speak, their species (Diluviumformica sapiens) consists of many smaller specimens, all working as a whole, communicating using touch and pheromones, the larger whole communicates with each other through much more powerful pheromones.

[Virtually immortal](https://worldbuilding.stackexchange.com/questions/45752/how-does-a-collective-consciousness-species-avoid-overpopulation) and destroying terraforming station, the Ant-hills must be stopped and we are ready to destroy them, but how?

The only option is a brutal ground war, as all solutions for space combat have been declared too risky to the safety of terraforming the world.

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Given all of these restrictions, How do us humans effectively conquer this jungle planet and defeat the inhabitants? Modern guns would fail on these multiple bodied aliens as would most weapons, what kind of cheap fighting would be effective on these collective consciousness?