In the summer of 68 BC Lucullus resumed the war against Tigranes, crossing the Anti-Taurus Range in a long march through very difficult mountain country directed at the old Armenian capital Artaxata. A major battle took place near the River Arsanias, where Lucullus once again routed the Armenian royal army. However, he had misjudged the time needed for a campaign so far into the Armenian Tablelands, where the good weather was unusually short lived, and when the first snows fell around the time of the autumn equinox his army mutinied and refused to advance any further. Lucullus led them back south to the warmer climes of northern Mesopotamia and had no trouble from his troops there despite setting them the difficult task of capturing the great Armenian fortress of Nisibis, which was quickly stormed and made the Roman base for the winter of 68–67 BC.