One can conclude from the passage that .......

The town of Gangba, known for its grazing lands was the centre of vast tracts where sheep huddled together against the Arctic winds. As darkness fell, you could hear the wild, whooping calls of the shepherds as they gathered in their flocks, sometimes hurrying the beasts along by firing a stone against their flanks from a catapult, and herding them into pens made of stone in the bosom of the mountain. They slept near them in small tents barely large enough even for one person.