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I'm pretty sure what I'm asking hasn't been asked before. Andragoras, satrap of Parthia, had won independence from the Seleucid Empire, alongside Diodotus I of Bactria, in the aftermath of Antiochus II's death and the capture of Antioch by the Ptolemies. He had a bit of difficulty raising up an army to defend his land and thus invited an invasion by the Parni led by Arsaces a couple of years later, aborting the chance for a Greco-Parthian state to emerge and leaving Bactria isolated from the rest of the Greek world. What if Andragoras managed to raise a large enough army and deter the Parni from invading or if they invade, conquer them?