(1811-1819): Zuurveld became a buffer zone between the Cape Colony and Xhosa territory, empty of the Boers, the British to the west and the Xhosa to the east. In 1811 the fourth war began when the Xhosa took back the rest of their territory of Zuurveld, conflicts with the settlers followed. Forces under Colonel John Graham drove the Xhosa back beyond the Fish River. The fifth war, the war of Nxele, was started by the 1817 judgment of the Cape Colony government about stolen cattle and the Colony's restitution by the Xhosa. A civil war ensued between the Ngqika and the Gcaleka Xhosa due to overcrowding, a Cape Colony-Ngqika defence treaty assisted the Ngqika in 1818. The Xhosa prophet, chief Maqana Nxele (Makana) emerged, under the command of Mdushane, AmaNdlambe's son, led 10,000 Xhosa force attack in 22 April 1819 to Grahamstown, which was held by 350 troops led by Jan Boesak repulsed Maqana. Maqana was captured and imprisoned on Robben Island. The British pushed the Xhosa further east beyond the Fish River to the Keiskamma River. The resulting empty territory was designated as a buffer zone for loyal Africans' settlements. It came to be known as the "Ceded Territories".