I'm not going to post on this tread anymore
Why not?
1. the Bysantine army was more advanced than the Roman one from ~1.5K years before, when it was finaly defeated in the Fall of Constantinople
2. The Parthian cavalry was heavily influenced by nomads;
3. Despite their many efforts, Rome's sway [...] they were stopped in the Middle East while the Han decided to stop in Central Asia.
Re 1: Why was it more advanced? That's a quality statement, based on what? The later Byzantine army was completely different from the Roman: organisation, troop type, the way soldiers were enlisted, everything. And that was around 1000 AD. By the time the city fell (another 5 centuries later), its army was completely different again.
Re 2: They were both adapted to fight the best possible way in their homelands: open land meaning cavalry and more cavalry. The lay of the land influenced both, not one the other.
Re 3: That's interesting: you say Rome WAS stopped, Han DECIDED to stop. That's another quality statement, so where's the explanation of both? If you just say "they both stopped" then that's more neutral, no discussion needed and all would agree. Now you have to explain your far reaching conclusion or it will be seen as invalid.
The comparison with Vikings vs. Native Americans is out of proportion
That's why I called it a joke. And so should any argument be treated that compares ethnically or geographically related armies to indirectly prove something, like saying "Byzantines lost to Seljuks, and Seljuks lost to Mongols. Therefore Han would defeat Romans." It's like comparing apples and ... what ... fish, or something.
I dare to say that those under Roman domination would have revolted and greeted the Han as liberators, given the history of upraisings there.
What history are you referring to? Border provinces were a buffer for Rome with it's neighboring empires. Any revolt was because those new border lands choose to be independent, the same reason why so many parts of the Han empire revolted as soon as its emperor showed weakness. Once the Roman economy took hold (and the buffer needed widening again), people were not interested in revolts anymore: who wants to lose wealth, peace and a huge internal economy?
BJ