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Everybody knows the two most annoying (and difficult) armies of enemies in the Halo universe. Now they face off, each with an army including 1000 of each size and type of enemy other than the Didact and the Gravemind. The Promethians get their usual weapons and the Flood get a mixture of both UNSC and Covenant weapons. There are two rounds:

1. In High Charity as it is during Cortana mission in Halo 3
2. In Requiem's core

Which side wins and why?

I think maybe flood can overrun the prometheans but they can't infect robot-like forerunners/ancient humans.

I have no idea.

Flood would stomp.