The Battle of Singara was fought in 344 between Roman and Sasanian Persian forces. The Romans were led in person by Emperor Constantius II, while the Persian army was led by King Shapur II of Persia. It is the only one of the nine pitched battles recorded to have been fought in a war of over twenty years, marked primarily by indecisive siege warfare, of which any details have been preserved. Although the Persian forces prevailed on the battlefield, both sides suffered heavy casualties.