In ancient times watchman would mount the city walls in times of stress to survey the scene outside the fortifications. He was situated on a spot from which he could monitor the approaches to the town. If a threat appeared, he would sound a warning and the town would shut its gates and prepare for battle.
With farmers letting fields lie fallow some produce will be in much shorter supply than usual, and it's likely that food prices will start rising before the end of the year.
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