《资治通鉴·陈纪·陈纪六》
起先北齐恐怕北周的军队突然来到，在城南凿通护城河，从乔山连接到汾水；北齐后主派出大批军队，在护城河的北面列阵，北周国主命令齐王宇文宪驰马去那里观察。
先是齐人恐周师猝至，于城南穿堑，自乔山属于汾水；齐主大出兵，陈于堑北，周主命齐王宪驰往观之。
At first, the Northern Qi were afraid that the Northern Zhou troops would arrive suddenly, so they dug through the moat south of the city, connecting Qiao Mountain to the Fen River. The emperor of the Northern Qi dispatched a large army to line up on the north side of the moat. The emperor of the Northern Zhou ordered Qi Wang Yuwen to ride there to observe.
<s>[INST] 请提供这段文言文的现代汉语解释: 先是齐人恐周师猝至，于城南穿堑，自乔山属于汾水；齐主大出兵，陈于堑北，周主命齐王宪驰往观之。 [/INST] 起先北齐恐怕北周的军队突然来到，在城南凿通护城河，从乔山连接到汾水；北齐后主派出大批军队，在护城河的北面列阵，北周国主命令齐王宇文宪驰马去那里观察。</s>
请提供这段文言文的现代汉语解释: 先是齐人恐周师猝至，于城南穿堑，自乔山属于汾水；齐主大出兵，陈于堑北，周主命齐王宪驰往观之。
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起先北齐恐怕北周的军队突然来到，在城南凿通护城河，从乔山连接到汾水；北齐后主派出大批军队，在护城河的北面列阵，北周国主命令齐王宇文宪驰马去那里观察。
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