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human
[Warhammer Fantasy/40k] Did the God-emperor drive the forces of chaos from Earth?

Hi, so I've been watching the total war: warhammer future factions series on youtube, and I just watched the beastmen episode about how they are servants of chaos and hate the races of men etc. So, I have a few questions:

1. Does Warhammer Fantasy take place in the past of the Warhammer 40k universe? 
2. Did the forces of chaos exist on Earth in any form in the 40k universe in medieval times even if it isn't in the same world as the Warhammer fantasy universe?
3. If these forces of chaos existed did they take any physical or corporeal forms such as that of the beastmen, and did the emperor of mankind drive chaos from Earth in the past? Were there machine gun wielding beastmen in the atomic age of manking (like 20th c.)?

Anyway, sorry if these questions are dumb, but I was just curious! Thanks for any responses!
gpt
40K and fantasy don't take place in a shared universe. There were no Chaos legions on Earth during the medieval age but that time period does coincide with the full manifestation of Khorne in the Warp. Although given the timeless nature of the Warp it always existed.