He reasoned that his best weapon was the cover of night.

On the next day, the Gallic attack was under the cover of night.

The city below still lay sleeping, except for those who, like herself were most likely to do business under the cover of night.

Not even under cover of night, when one might be tempted.

This time, he would go alone and under the cover of night.

A man coming through that window under cover of night.

Well, there was no great hardship in that, for I could do it under the cover of night.

My own flesh and blood stolen away under cover of night!

Each was brought in separately and under cover of night.

The cover of night would serve him well when he staggered back in.