Singara (Persian Wars).
Fought 348, between the Romans, under Constantius, and the Persians, in largely superior force, under Sapor II. The Persian king, having posted the major part of his army on the heights overlooking Singara, engaged the Romans with a comparatively small force of light-armed troops, who were easily routed by the legionaries. The pursuit, however, was carried too far, and when night fell, the Romans, exhausted by their efforts, bivouacked under the heights. During the night, Sapor led his best troops to the attack, and routed the weary Romans, with terrible slaughter.