As Picard expected, the door itself was closed, without even a single sentry posted outside for security.

A single sentry failed to get the message or refused to heed it.

A single sentry at any point along the wall would easily know of the intruders.

Their entrance into the chamber caught the single sentry in the middle of a yawn.

The companions crept closer to the castle without seeing a single sentry.

The guard post at the main gate was manned by a single sentry.

We were conducted to one of these buildings, before the entrance to which a single sentry stood.

A single sentry stood outside, seldom at attention.

A single sentry each watch should do, giving his troopers a much-needed rest.

The single sentry came to attention and presented his musket.