Time Wars - Clash with the Past!

“BREAKING NEWS! There has been an accident in the Time Machine Factory! Portals have opened around the globe and hostile armies from history are attacking us!” Every person from eras such as the viking age, wild west, medieval times, as well as modern times, have been teleported to our world and they will wreak havoc in the epic clash of epochs! Thus they have become our enemies and your only duty is to assemble an army by making soldiers from factories and fight for the sake of the current timeline!