 Sources are silent regarding the events following the first Persian campaign but the silence in itself is an indication of the peace that prevailed and that the Persians stopped being a threat to the Roman East . The evidence for the second campaign is <unk> ; Zosimus is the only one to mention it specifically . A passage in the <unk> <unk> is interpreted by Hartmann as an indication of the second invasion . The campaign took place in 266 or 267 and was aimed directly at Ctesiphon ; Odaenathus reached the walls of the Persian capital but had to cancel the siege and march north to face the influx of <unk> riders attacking Anatolia . 
