Fallen and Cabal do not fight each other in the current game. That could be because Fallen are not on Mars and Cabal are not on any other planet, to date.
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Yeah, I just figured they have a "You don't get in our way, we wont get in yours" deal going on. And can't remember where I read it, but I could've sworn I came across something mentioning first contact with the Cabal happening on Earth, like pre-Twilight Gap. Six fronts maybe?