《新唐书·列传·卷一百四十》
默啜留下遮弩，自己率兵两万袭击娑葛，擒住娑葛。
默啜留遮弩，自以兵二万击娑葛，禽之。
Mochuo kept Zhe Nu and led 20,000 troops to attack Sogdia, capturing him.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 默啜留遮弩，自以兵二万击娑葛，禽之。 [/INST] Mochuo kept Zhe Nu and led 20,000 troops to attack Sogdia, capturing him.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 默啜留遮弩，自以兵二万击娑葛，禽之。
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Mochuo kept Zhe Nu and led 20,000 troops to attack Sogdia, capturing him.
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