"The Black Mountain adjoins the territory of the Wali of Swat. It is so called from the dark forests of that cover its slopes. The eastern sides are held by Swatis.The western ridge is the homeland of Yousafzai tribes. There is constant struggle among small tribal chiefs. The most important of these is the Nawab of Amb. He enjoys the unique distinction of being an independent chief across the Indus. The Nawab of Amb has an arms factory. He manufactures rifled cannon. This cannon can throw a solid ball 3000 yards. It is a useful weapon for pounding to pieces a tribal fortress."