The tribe had been warned of the Rangers' approach and set the prairie ablaze.

Jim set up a defensive perimeter that would've warned them of Vellyngaith's approach!

Two trains passed through the tunnel going in both directions, the men were warned of their approach by the watchman.

He would be warned of the enemy's approach in time for a fighting chance at escape.

A rider came to warn of their approach just before noon the next day.

Now he could merely warn of its approach.

The creaking of a plank warned her of Jack's approach.

The early afternoon offered the kind of ebbing light that warned of winter's approach.

Within the trees where they crept, it was a giant's breath that warned of its owner's approach.

The sound of the housekeeper's keys warned of her approach.