Thanos Thanos:
You mean the American military, in conjunction with allies, did it. All according to a plan drawn up by the Obama administration years ago, with the final result put into jeopardy of collapse thanks to the current POSPOTUS threatening to withdraw the American military presence altogether. "Not our problem! MAGA!".
The US military, in conjunction with the Syrians, the Russians, the Iranians, the Iraqis, the Turks, the Jordanians, and the Israelis defeated the Saudi sponsored ISIS.
I would not call that an 'alliance' but simply more of a
concurrence of force.