The fourth of
王昌龄's seven is the famous one:
青海长云暗雪山,
孤城遥望玉门关。
黄沙百战穿金甲,
不破楼兰终不还。 'Long clouds over Qinghai darken the snowy peaks; from a lone fort we gaze toward Jade Gate Pass. In the yellow sands a hundred battles have worn through our armour; until we take Loulan we will not go home.'