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 it fell to Dr. John Colin Carothers to perform the desired analysis. This ethnopsychiatric analysis guided British psychological warfare, which painted Mau Mau as "an irrational force of evil, dominated by bestial impulses and influenced by world communism", and the later official study of the uprising, the Corfield Report. The psychological war became of critical importance to military and civilian leaders, who waged it in the time-honoured colonial fashion of divide and rule, always trying to "emphasise that there was in effect a civil war, and that the struggle was not black versus white", attempting to isolate Mau Mau from