Then the army advanced in regular formation, the Adorsi in the van and the rear, while the centre was strengthened by the cohorts, and native troops of Bosporus with Roman arms. Thus the enemy was defeated, and they reached Soza, a town in Dandarica, which Mithridates had abandoned, where it was thought expedient to leave a garrison, as the temper of the people was uncertain. Next they marched on the Siraci, and after crossing the river Panda besieged the city of Uspe, which stood on high ground, and had the defence of walls and fosses; only the walls, not being of stone, but of hurdles and wicker-work with earth between, were too weak to resist an assault. Towers were raised to a greater height as a means of annoying the besieged with brands and darts. Had not night stopped the conflict, the siege would have been begun and finished within one day.