The invader-king is the typical ancient tyrant... wow. They unknowingly opened the gate to 'hell' & they thought they're gonna win anyway?
I find this very interesting though. It's like "if the modern century meets the ancient, how will it fare, war & politics-wise?" But honestly, humans are pretty much the same, old & new. There will be greedy & ignorant people that holds power at any point in time since forever, who will repeat the bad part of history over & over again because they simply never learn from other's mistakes. All they see is in the now, never the past or future which makes them very short-sighted & narrow-minded.