The Romans and Mongolians did have huge empires and relativly small armies, but Germany would have to deal with the effects of modern technology. An individual can shoot you at 1000 yards with a sniper rifle, obliterate your tank with a Panzerfaust, blow up you vital bridge as you're driving over it. A small group of resistance fighters could machine-gun your convoy, rain mortar shells on you base from a mile away, or pin down an entire company with accurate rifle fire. Even helecopters won't fix everything. The M-24 HINDs in Afganistan were demi-gods until the Afgans got Stinger missiles. Still, they were vulnerable to heavy machine-gun fire (especialy from above, aiming for the rotor) and just shooting lots of RPGs and assault rifles will work if you're lucky, like in Black Hawk Down. The Romans and Mongolians only needed to worry about archers and backstabing locals.
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