《左传·庄公·庄公十六年》
夏季，宋国、齐国、卫国一起攻打郑国。
夏，宋人、齐人、卫人伐郑。
In summer, the states of Song, Qi, and Wei attacked Zheng together.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 夏，宋人、齐人、卫人伐郑。 [/INST] In summer, the states of Song, Qi, and Wei attacked Zheng together.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 夏，宋人、齐人、卫人伐郑。
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In summer, the states of Song, Qi, and Wei attacked Zheng together.
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