Electronic sensors stand silent sentry at the chamber's end, counting passengers.

Two silent sentries in tiger-striped uniforms stood in the lot before the main gate to the fortress.

For a mailbox drive-by you need bored kids, quiet streets and long driveways with mailboxes like silent sentries at the end.

As always, Abraham Mendes stood silent sentry over his master.

Empty hulls of old grandfather clocks stood silent sentry in shadows, and I spotted ancient radios and televisions, too, along with miscellaneous furniture thick with dust.

In front of Starbucks and Gap stores around the city, they sipped coffee and stood silent sentry.

But untold eons had taken their toll, so that now it was a worn, misshapen cross between the two, standing as a silent sentry among ruins older than humanity itself.

She said she welcomed those silent sentries.

Jason went out past the still silent sentry and headed back towards the refinery station.

Red-glowing gargoyles, the standard of the house, glared down from a hundred perches like silent sentries.