The Hamidon Wars refers to Praetoria's war on Hamidon. In Praetoria, nuclear weapons were used much earlier, advancing the timeline. Dr. Hamidon grew to power much faster and much more completely, basically obliterating Earth with his Devouring Earth. Emperor Cole was a main player in pushing back Hamidon, allowing the city of Praetoria to become a safe haven, a home base for humanity.
While Hamidon has been pushed back, he has not been completely conquered, and the rest of Praetorian Earth is still a wasteland ruled by the Devouring Earth.