Oh, right. Forgot to mention that their body have a cape that can evade anything like oil, fire, earth, water, and wind (no, I'm not talking about Avatar) and so the ants body have a sharp teeth
and gang (?) that could penetrate all, no matter what it is (including the sandpaper one).
And with the army of (I dunno how many 9), it is possible for them to enter one of the hole (like ear or nostril) of War to defeat him.