《新唐书·列传·卷一百五十》
恰逢巢军传染瘟疫，死者有十分之四，巢领兵北还。
会贼中大疫，众死什四，遂引北还。
It happened that Chao's army was infected with the plague and four out of ten died. Chao led his troops back north.
<s>[INST] 请提供这段文言文的现代汉语解释: 会贼中大疫，众死什四，遂引北还。 [/INST] 恰逢巢军传染瘟疫，死者有十分之四，巢领兵北还。</s>
请提供这段文言文的现代汉语解释: 会贼中大疫，众死什四，遂引北还。
user
恰逢巢军传染瘟疫，死者有十分之四，巢领兵北还。
assistant