pursue a routed army
Chasing the north is a Chinese idiom. The Pinyin is Zhu ī B ē nzh ú B ě I, which means to pursue the defeated enemy. It comes from the Han Dynasty Jia Yi's Guo Qin Lun.
The origin of Idioms
Han Jiayi's on crossing the Qin Dynasty: "chasing the subjugated and chasing the north, one million corpses." Li Ling's answer to Su Wu Shu in the Han Dynasty: "however, you still have to cut the flag of the general, chase the north, wipe out the trace and sweep away the dust, and kill the commander."
Idiom usage
To pursue a defeated enemy
Examples
His elite horse team, also from the desert, chasing north, is his strong point. Gao Yang's "jade seat and Pearl curtain" Volume I
Chinese PinYin : zhuī bēn zhú běi
pursue a routed army
live just for the sake of remaining alive. cǎo jiān qiú huó
an old head on young shoulders. shào nián lǎo chéng
Peach blossom and willow blossom. táo yāo liǔ mèi