《后汉书·列传·郭杜孔张廉王苏羊贾陆》
匈奴曾经以一万骑侵入渔阳，张堪率数千骑奔袭，大破匈奴兵，渔阳郡界得以安静。
匈奴尝以万骑入渔阳，堪率数千骑奔击，大破之，郡界以静。
The Huns once invaded Yuyang with 10,000 cavalry, Zhang Kan led thousands of cavalry to attack, defeated the Huns, and the border of Yuyang County was quiet.
<s>[INST] Kindly elucidate the central themes in this passage in English: 匈奴尝以万骑入渔阳，堪率数千骑奔击，大破之，郡界以静。 [/INST] The Huns once invaded Yuyang with 10,000 cavalry, Zhang Kan led thousands of cavalry to attack, defeated the Huns, and the border of Yuyang County was quiet.</s>
Kindly elucidate the central themes in this passage in English: 匈奴尝以万骑入渔阳，堪率数千骑奔击，大破之，郡界以静。
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The Huns once invaded Yuyang with 10,000 cavalry, Zhang Kan led thousands of cavalry to attack, defeated the Huns, and the border of Yuyang County was quiet.
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