And now we are in territory of bizarre wargame scenario.
If the army of the past came to present they are dead in the water. All you need is to know where their leader is and assassinate them, sniper rifle, explosives thrown from helicopter etc. You don't need military equipment, as the past people have no experience and knowledge of mode technology.
Other way around - modern army in the past - is a bit too complex (too many variables/scenarios) to write in a comment. That is territory of a podcast episode or two :)
If the army of the past came to present they are dead in the water. All you need is to know where their leader is and assassinate them, sniper rifle, explosives thrown from helicopter etc. You don't need military equipment, as the past people have no experience and knowledge of mode technology.
Other way around - modern army in the past - is a bit too complex (too many variables/scenarios) to write in a comment. That is territory of a podcast episode or two :)