《资治通鉴·唐纪·唐纪五十四》
于是，田季安采用了谭忠的计谋，与成德暗中商议，得到了成德的堂阳县。
遂用忠之谋，与赵阴计，得其堂阳。
As a result, Tian Jianan followed Tan Zhong's strategy and secretly negotiated with Chengde, obtaining Chengde's Tangyang County.
<s>[INST] First, translate the Classical Chinese text into modern Chinese and then into English. Classical Chinese: 遂用忠之谋，与赵阴计，得其堂阳。 [/INST] 于是，田季安采用了谭忠的计谋，与成德暗中商议，得到了成德的堂阳县。 Then, As a result, Tian Jianan followed Tan Zhong's strategy and secretly negotiated with Chengde, obtaining Chengde's Tangyang County.</s>
First, translate the Classical Chinese text into modern Chinese and then into English. Classical Chinese: 遂用忠之谋，与赵阴计，得其堂阳。
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于是，田季安采用了谭忠的计谋，与成德暗中商议，得到了成德的堂阳县。 Then, As a result, Tian Jianan followed Tan Zhong's strategy and secretly negotiated with Chengde, obtaining Chengde's Tangyang County.
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