《资治通鉴·晋纪·晋纪十六》
夏季，四月，后赵将领石堪攻宛，南阳太守王国投降；石堪随即进攻驻于淮水岸边的祖约。
夏，四月，后赵将石堪攻宛，南阳太守王国降之；遂进攻祖约军于淮上。
In summer, in April, Hou Zhao general Shi Kan attacked Wan. The prefect of Nanyang, Wang Guo, surrendered. And then Shi Kan attacked Zu Yue who was at the bank of the Huai river.