Muawiyah's command of water supply
As the troops of Ali arrived in the valley of Siffin, it was found that the forces of Muawiyah had already occupied the best part of the valley. There was only one source of water supply in the valley, and Muawiyah had so arrayed his forces that they controlled the water supply of the whole valley, and the troops of Ali had no access to water at any place. The strategy of Muawiyah obviously was to force a defeat on Ali by exposing his troops to the rigors of thirst.
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