Basle was once surrounded by enemies, and very hard pressed on all sides. A troop of discontented citizens made a shameful compact with the besiegers to help them to conquer the town. It was arranged one dark night that exactly as the clock was striking twelve the attack was to be made from within and without. The traitors were all ready, waiting for midnight in great excitement, having no evil presentiments of what was about to happen.

The expected hour approached. Accidentally the watchman of the tower heard of the proposed attack, and no time being left to warn the commander of the garrison or the guard, he quickly and with great presence of mind determined upon a safe expedient; he put forward the hand of the great clock one hour, so that instead of striking midnight, the clock struck one.