《宋史·本纪·卷四十七》
十四日，秀王赵与真在瑞安阻战，观察使李世达战死。
甲辰，秀王与逆战于瑞安，观察使李世达死之。
On the 14th day, the Viscount Zhao Yuzhen fought in Ruian, and the Observation Envoy Li Shida died in battle.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 甲辰，秀王与逆战于瑞安，观察使李世达死之。 [/INST] On the 14th day, the Viscount Zhao Yuzhen fought in Ruian, and the Observation Envoy Li Shida died in battle.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 甲辰，秀王与逆战于瑞安，观察使李世达死之。
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On the 14th day, the Viscount Zhao Yuzhen fought in Ruian, and the Observation Envoy Li Shida died in battle.
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