 Odaenathus assembled the Palmyrene army and Syrian peasants then marched north to meet the Persian emperor , who was back from Cilicia . The Palmyrene monarch fell upon the retreating Shapur at a place between <unk> and <unk> west of the Euphrates in late summer 260 . Odaenathus defeated the Persians , <unk> Shapur from the province of Syria . However , the <unk> kept the regions east of the Euphrates . 
