《新唐书·列传·卷一百二十八》
贼兵想绕道出张巡之后去骚扰江淮，张巡退兵于睢阳，扼守东南咽喉。
贼欲绕出巡后以扰江淮，巡退军睢阳，扼东南咽领。
The traitorous army wanted to take a detour and harass Jiang and Huai after Zhang Xun, Zhang Xun withdrew his army to Suiyang, defending the southeastern throat.
<s>[INST] Kindly elucidate the central themes in this passage in English: 贼欲绕出巡后以扰江淮，巡退军睢阳，扼东南咽领。 [/INST] The traitorous army wanted to take a detour and harass Jiang and Huai after Zhang Xun, Zhang Xun withdrew his army to Suiyang, defending the southeastern throat.</s>
Kindly elucidate the central themes in this passage in English: 贼欲绕出巡后以扰江淮，巡退军睢阳，扼东南咽领。
user
The traitorous army wanted to take a detour and harass Jiang and Huai after Zhang Xun, Zhang Xun withdrew his army to Suiyang, defending the southeastern throat.
assistant