《魏书·列传·卷二十九》
到了围攻姑臧的时候，因此而不再担心有人声援，能够集中兵力攻打它。
及围姑臧，由是无外虑，故得专力攻之。
By the time they besieged Guxang, they no longer worried about reinforcements, and could focus all their energy on the attack.
<s>[INST] 将以下英文转换为文言文: By the time they besieged Guxang, they no longer worried about reinforcements, and could focus all their energy on the attack. [/INST] 及围姑臧，由是无外虑，故得专力攻之。</s>
将以下英文转换为文言文: By the time they besieged Guxang, they no longer worried about reinforcements, and could focus all their energy on the attack.
user
及围姑臧，由是无外虑，故得专力攻之。
assistant