 Complete the following phrase:  Despite these successes, the Parthians were soon driven out of the Levant by a Roman counteroffensive. Publius Ventidius Bassus, an officer under Mark Antony, defeated and then executed Labienus at the Battle of the Cilician Gates in modern Mersin Province, Turkey in 39 BC. Shortly afterward, a Parthian force in Syria led by general Pharnapates was defeated by Ventidius at the Battle of Amanus Pass. As a result, Pacorus I temporarily withdrew from Syria. When he returned in the spring of 38 BC, he faced Ventidius at the 