Perhaps, even, their commanders had been warned of my presence on board the "Terror."

A light touch will warn them of your presence.

All vessels had not been warned of the others' presence.

The voice that warned him of the Devil's presence is still ringing, though faintly, in his ears.

But Imrryr will be warned of our presence by then!

After we had been discovered and everyone warned of our presence, to stay on near the coast seemed to me unpromising.

A bell may be used to warn of a cyclist's presence.

Use your bell to warn of your presence - not to harass people.

He made a movement finally that warned them of his presence; they turned instantly.

If there were he would hear or see enough to warn him of their presence.