《北史·本记·卷七》
下诏征召民夫一百八十万人修建长城，从幽州北面的夏口开始，西到恒州，长九百多里。
诏发夫一百八十万人筑城，自幽州北夏口，西至恆州，九百余里。
An imperial edict was issued to conscript 1.8 million civilians to build the Great Wall, starting from Xiakou in the north of Youzhou and stretching 900 miles west to Hengzhou.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 诏发夫一百八十万人筑城，自幽州北夏口，西至恆州，九百余里。 [/INST] An imperial edict was issued to conscript 1.8 million civilians to build the Great Wall, starting from Xiakou in the north of Youzhou and stretching 900 miles west to Hengzhou.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 诏发夫一百八十万人筑城，自幽州北夏口，西至恆州，九百余里。
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An imperial edict was issued to conscript 1.8 million civilians to build the Great Wall, starting from Xiakou in the north of Youzhou and stretching 900 miles west to Hengzhou.
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