The year is UC 0300
Humanity has moved past Jupiter and is now stretching its colonies towards Saturn's moons.
War starts when Colony Holo declares Independence.
They send 5 Machines to the Earth Sphere called "Gundams" in an Operation called "Holomyth" to destroy the foundations of the corrupt Earth sphere called "Rrats".
https://www.youtube.com/watch?v=ICOwBtm8L_s