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The victors at Carrhae attempted to seize Roman territory in Syria but they were beaten back by the remaining Roman forces under Cassius, who was later one of the ringleaders in the assassination of Julius Caesar regrouped in Syria. Suren despite his victory was later executed by the Parthian monarch who feared him as a rival. This may have been a blessing for the Romans as without the leadership and strategic vision of Surena, the Parthians meaning that they failed to secure their objectives. Cassius proved to be a very capable leadergeneral. The Parthian Crown Prince invaded Syria but was ambushed by Cassius, defeated and killed. However, the Parthians were able to conquer the strategic kingdom of Armeniain the Caucuses. From here they were able to threaten the Roman possessions in Asia Minor, a situation that was to last for many decades. Carrhae left the Roman East exposed and it was to be invaded several times in the next decades by Parthia. Syria was occupied twice by the Parthiansand on one occasion they installed a puppet king in Judea. For several decades until the reign of Augustus, the Roman East was left exposed to regular Parthian incursions and interference, by the defeat of Crassus in 53 BC.