Mau Mau Uprising attempt to eliminate Mau Mau's presence within Nairobi in one fell swoop. 25,000 members of British security forces under the control of General George Erskine were deployed as Nairobi was sealed off and underwent a sector-by-sector purge. All native Kenyans were taken to temporary barbed-wire enclosures, whereafter those who were not Kikuyu, Embu or Meru were released; those who were remained in detention for screening. Whilst the operation itself was conducted by Europeans, most suspected members of Mau Mau were picked out of groups of the Kikuyu-Embu-Meru detainees by a native Kenyan informer. Male suspects were then taken off for
Mau Mau Uprising areas. Militarily, the British defeated Mau Mau in four years (1952–56) using a more expansive version of "coercion through exemplary force". In May 1953, the decision was made to send General George Erskine to oversee the restoration of order in the colony. By September 1953, the British knew the leading personalities in Mau Mau, the capture and 68 hour interrogation of General China on 15 January the following year provided a massive intelligence boost on the forest fighters. Erskine's arrival did not immediately herald a fundamental change in strategy, thus the continual pressure on the gangs remained, but he created