《资治通鉴·隋纪·隋纪五》
只愿陛下严厉约束各军，星驰速发，水陆并进，出其不意，那么平壤这座孤城，势必被攻克。
唯愿严勒诸军，星驰速发，水陆俱前，出其不意，则平壤孤城，势可拔也。
I hope only that Your Majesty will strictly command the armies, start at once, and advance together on land and by sea. If we take them by surprise, then the isolated fortress of Pyongyang will definitely be captured. 