From Armenia, however, Pompey was forced to again march north in order to deal for a second time with Oroeses, who had revolted at the first opportunity. In the summer of 65 BC therefore, the Romans crossed again into Albania. The obstacle of the fast-flowing River Cyrus (or Cyrnus) was surmounted by having the horses and pack animals cross upstream of the main army, in order to break the violence of the current with their bodies, as Dio says, so that the bulk of Pompey's force could then ford the shallows further downstream, without being swept off their feet. With the Romans advancing through Albania, Oroeses nonetheless refused to give battle, and Pompey had to continue the march ever deeper into enemy territory, looking for a decisive engagement. The march was made during excessive heat and with little carried water, and so upon reaching the River Cambyses (likely the Iori), the thirsty Romans drank excessively of the cold waters, which, however, due to their chill, caused many to fall ill. In consequence, Pompey had ten thousand animal skin flasks supplied and filled with drinking water for the march. Still without resistance, Pompey then continued to the Abas, and crossed it; now approaching the shadow of the Greater Caucasus Mountains.