In 1851 two officers of the British Customs (Salt) department within the borders of Tanawal were killed, allegedly by the Hasanzai sect of the Yusufzai. The British then sent an expedition under Colonel Mackeson, which destroyed a number of tribal strongholds. In 1868 the Yusufzai, instigated by the Khan of Agror, who resented the establishment of the police post at Oghi in the Agror valley, attacked that post in force, but were repulsed. Further attacks on the troops of the Khan of Tanawal, who remained loyal, followed. This culminated in a general advance of The Black Mountain (Tor Ghar) Tribes against the British position. It was repulsed, but not until 21 British villages had been burnt, and a second expedition under General Wilde had overrun the Black Mountain and secured the full submission of the tribes.