Operation Anvil (Mau Mau Uprising) authorities. Within 48 hours the British had detained 206 known insurgents. In the following weeks over 50,000 Africans were detained and questioned. Nevetheless, numerous leading figures among the rebels managed to escape from Nairobi into the countryside. The operation ended on 26 May. Operation Anvil marked a turning-point in the British campaign against the Mau Mau. The action left the insurgents mostly isolated in the forested mountains of Nyandarwa and Kirinyaga without access to supplies and the assistance of passive supporters. It proved to be the most sophisticated undertaking of the Kenyan Emergency. In the following weeks Mau Mau activity
Mau Mau Uprising Mau", claim it was an anagram of "Uma Uma" (which means "get out get out") and was a military codeword based on a secret language-game Kikuyu boys used to play at the time of their circumcision. Majdalany goes on to state that the British simply used the name as a label for the Kikuyu ethnic community without assigning any specific definition. As the movement progressed, a Swahili backronym was adopted: "Mzungu Aende Ulaya, Mwafrika Apate Uhuru" meaning "Let the foreigner go back abroad, let the African regain independence". J.M. Kariuki, a member of Mau Mau who was detained during the