Sultan Orodes was too much indebted to the heroic prince, who had first placed the crown on his head and then cleared the land from the enemy, not to get rid of him as soon as possible by the executioner.
His place as commander-in-chief of the invading army destined for Syria was filled by a prince, the king's son Pacorus, with whom on account of his youth and inexperience the prince Osaces had to be associated as military adviser.

On the other side the interim command in Syria in room of Crassus was taken up by the prudent and resolute quaestor Gaius Cassius.
Repulse of the Parthians The Parthians were, just like Crassus formerly, in no haste to attack, but during the years 701 and 702 sent only weak flying bands, who were easily repulsed, across the Euphrates; so that Cassius obtained time to reorganize the army in some measure, and with the help of the faithful adherent of the Romans, Herodes Antipater, to reduce to obedience the Jews, whom resentment at the spoliation of the temple perpetrated by Crassus had already driven to arms.
The Roman government would thus have had full time to send fresh troops for the defence of the threatened frontier; but this was left undone amidst the convulsions of the incipient revolution, and, when at length in 703 the great Parthian invading army appeared on the Euphrates, Cassius had still nothing to oppose to it but the two weak legions formed from the remains of the army of Crassus.
Of course with these he could neither prevent the crossing nor defend the province.

Syria was overrun by the Parthians, and all Western Asia trembled.

But the Parthians did not understand the besieging of towns.

They not only retreated from Antioch, into which Cassius had thrown himself with his troops, without having accomplished their object, but they were on their retreat along the Orontes allured into an ambush by Cassius' cavalry and there severely handled by the Roman infantry; prince Osaces was himself among the slain.