《北史·列传·卷八十七》
开皇十八年，诏令蜀王杨秀从灵州道出兵打击都蓝。
十八年，诏蜀王秀出灵州道击之。
In the 18th year of the Kaihuang era, an edict was issued ordering King Yang Xiu of Shu to lead troops to attack Duluo from Lingzhou Road.
<s>[INST] Kindly elucidate the central themes in this passage in English: 十八年，诏蜀王秀出灵州道击之。 [/INST] In the 18th year of the Kaihuang era, an edict was issued ordering King Yang Xiu of Shu to lead troops to attack Duluo from Lingzhou Road.</s>
Kindly elucidate the central themes in this passage in English: 十八年，诏蜀王秀出灵州道击之。
user
In the 18th year of the Kaihuang era, an edict was issued ordering King Yang Xiu of Shu to lead troops to attack Duluo from Lingzhou Road.
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