 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.The Roman governor of Arabia, a certain Trassus, confronted Palmyra's approaching army while commanding the Legio III Cyrenaica, but was routed and killed in action.