system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40k] What happens if a ship containing a Space Marine chapter arrives in OUR world? Also they manage to recognize our world as Holy Terra. What would they do?

Would they try to take over the Earth or would they chill since they don't know if the Emperor has been born yet?
gpt
We're fucked. We'd probably be pretty fucked if it was just a single Space Marine company.

They conquer the world, overthrow all governments, and remake the political and social structures in the image of the Holy Terra they know and await the coming of the Emperor.