As the Mongol warriors withdrew from the cities of the Jurched, they had one final punishment to inflict upon the land where they had already driven out the people and burned their villages. Genghis Khan wanted to leave a large open land with ample pastures should his army need to return. The plowed fields, stone walls, and deep ditches had slowed the Mongol horses and hindered their ability to move across the landscape in any direction they wished. The same things also prevented the free migration of the herds of antelope, asses, and other wild animals that the Mongols enjoyed hunting. When the Mongols left from their Jurched campaign, they churned up the land behind them by having their horses trample the farmland with their hooves and prepare it to return to open pasture. They wanted to ensure that the peasants never returned to their villages and fields. In this way, Inner Mongolia remained a grazing land, and the Mongols created a large buffer zone of pastures and forests between the tribal lands and the fields of the sedentary farmers. The grassy steppes served as ready stores of pasturage for their horses that allowed them easier access in future raids and campaigns, and they provided a ready store of meat in the herds of wild animals that returned once the farmers and villagers had been expelled.