 (Not even during the early 1850s, under the Ngoni reign of terror, did they live in crowded settlements).It probably strengthened the Sangu, but increased the danger of famine for the Safwa and reduced their agricultural possibility.Since the Germans returned the Wasangu to the territory of the Wahehe, the population of the Safwa, finally free of the Wasangu, has gone from 9,000 in 1910, 15,000 in the 1920s, and 63,000 in 1957.