《资治通鉴·汉纪·汉纪三》
由此冒顿知道这些兵士可以使用了，便在随同头曼出猎时，用响箭射头曼，他的部众即跟着响箭同射单于。
于是冒顿知其可用。从头曼猎，以鸣镝射头曼，其左右亦皆随鸣镝而射。
By this Maodun knew he could use these soldiers, so when he accompanied Chanyu Toutuman on a hunt, he shot a signaling arrow at Toutuman, and his people followed the signaling arrow and also shot at the Chanyu.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 于是冒顿知其可用。从头曼猎，以鸣镝射头曼，其左右亦皆随鸣镝而射。 [/INST] By this Maodun knew he could use these soldiers, so when he accompanied Chanyu Toutuman on a hunt, he shot a signaling arrow at Toutuman, and his people followed the signaling arrow and also shot at the Chanyu.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 于是冒顿知其可用。从头曼猎，以鸣镝射头曼，其左右亦皆随鸣镝而射。
user
By this Maodun knew he could use these soldiers, so when he accompanied Chanyu Toutuman on a hunt, he shot a signaling arrow at Toutuman, and his people followed the signaling arrow and also shot at the Chanyu.
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