"Go quickly, before darkness, falls, and bring them down into camp."

"If we don't catch them before darkness, there's no knowing what they might do to her."

I think we must return to our ship before true darkness.

Three or four minutes, that was all, before darkness began closing in.

But she had seen something; because just before full darkness, there was a knocking at the door.

Tonight I would like to get to it before darkness falls.

There was no reason to hurry, after all; the boat could not come in to pick them up before darkness fell.

Even with evening coming on, he would make it back to the city before complete darkness.

We have several more miles to cover before darkness.

"Now let's get on with our business before darkness falls."