When the UNSC is at the height of it's power. I think the covanent would be gang banged by the Tau, Necrons, Hrud, Orks, Eldar, and Squats. The Imperium can field much larger numbers then the UNSC.
Updated OP to Cumbeans vs. 40k.The Combine would have NOTHING to combat a Titan, especially not Legio Ordo Sinister.
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