In 358 Shapur II was ready for his second series of wars against Rome, which met with much more success. In 359, Shapur II invaded southern Armenia, but was held up by the valiant Roman defence of the fortress of Amida (now Diyarbakır, Turkey), which finally surrendered in 359 after a seventy-three-day siege in which the Persian army suffered great losses. The delay forced Shapur to halt operations for the winter. Early the following spring he continued his operations against the Roman fortresses, capturing Singara and Bezabde (Cirze?), again at a heavy cost. In the next year Constantius II launched a counterattack, having spent the winter making massive preparations in Constantinople; Shapur, who had meanwhile lost the aid of his Asianic allies, avoided battle, but left strong garrisons in all the fortresses which he had captured. Constantius laid siege to Bazabde, but proved incapable of taking it, and retired on the approach of winter to Antioch, where he died soon after.