The guard set round the building was close and vigilant, and the chances of escape appeared small.

Still, Harry thought that if he could escape from an upper window on a dark night he could surely make his way through the line of sentries.

He had observed on moonlight nights the exact position which each of these occupied.

The intervals were short between them; but it would be quite possible on a dark night for a person to pass noiselessly without being perceived.

The watch would have been even more strict than it was, had not the Puritans regarded the struggle as virtually at an end, and were, therefore, less careful as to their prisoners than they would otherwise have been.