 The conflict of Palmyra's economic interest with as Bostra and Egypt receiving trade which would have otherwise passed through Palmyra also played a part.Regardless, the defiance of the Tanukhids against Palmyrene domination is probably the main reason which triggered a military response from Zenobia.The attack seemed to be intentionally timed, as the Palmyrene army south to Bostra while the Romans were preoccupied with their battles against the Goths in the mountains of Thrace.