John Wesley on Joel 2:9

Runs to and fro - This seems not proper to these insects, but it well suits with soldiers, that conquer a city and search all places for plunder. Run upon the wall - To clear the wall of all the besieged. The houses - Either forsaken by the inhabitants, or defended by such as are in them. Like a thief - Suddenly, unexpectedly, to spoil if not to kill.