 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?