秋毫无犯的英文：
[Literal Meaning]
the fine down of birds or animals in autumn, a metaphor for very tiny things/not/offend
not to disturb even the tiniest things

[解释]
秋毫：鸟兽秋天新换的绒毛，比喻极细微的东西。形容军队纪律严明，丝毫不侵犯人民的利益。

[Explanation]
(of high disciplined troops) not commit the slightest offence against civilians

[例子]
他领导的起义军进入首都之后，秋毫无犯，老百姓很支持他们。

[Example]
After the rebels led by him entered the capital, his army did not commit the slightest offence against civilians and were welcomed by the people.

Do not cause the slightest damage(to the people);forbid the slightest violation of(the people's interest)
秋毫无犯

This army doesn't commit the slightest offence against the civilians.
这支部队对老百姓秋毫无犯。