《资治通鉴·汉纪·汉纪十一》
汉军渡过黄河，从朔方以西到令居县，处处开通河渠，设置田官，派士卒五六万人屯垦，逐渐蚕食到匈奴旧地以北。但也因缺少马匹，不再大举出击匈奴了。
汉渡河自朔方以西至令居，往往通渠，置田官，吏卒五六万人，稍蚕食匈奴以北；然亦以马少，不复大出击匈奴矣。
The Han army crossed the Yellow River, from west of Shuofang to Lingju County, and opened up canals everywhere, set up field officials, and dispatched 50,000 to 60,000 soldiers to reclaim land, gradually encroaching on the old land north of the Huns. But due to the lack of horses, they did not make any large-scale attacks on the Huns.
<s>[INST] Kindly elucidate the central themes in this passage in English: 汉渡河自朔方以西至令居，往往通渠，置田官，吏卒五六万人，稍蚕食匈奴以北；然亦以马少，不复大出击匈奴矣。 [/INST] The Han army crossed the Yellow River, from west of Shuofang to Lingju County, and opened up canals everywhere, set up field officials, and dispatched 50,000 to 60,000 soldiers to reclaim land, gradually encroaching on the old land north of the Huns. But due to the lack of horses, they did not make any large-scale attacks on the Huns.</s>
Kindly elucidate the central themes in this passage in English: 汉渡河自朔方以西至令居，往往通渠，置田官，吏卒五六万人，稍蚕食匈奴以北；然亦以马少，不复大出击匈奴矣。
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The Han army crossed the Yellow River, from west of Shuofang to Lingju County, and opened up canals everywhere, set up field officials, and dispatched 50,000 to 60,000 soldiers to reclaim land, gradually encroaching on the old land north of the Huns. But due to the lack of horses, they did not make any large-scale attacks on the Huns.
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