Mau Mau Uprising more mobile formations that delivered what he termed "special treatment" to an area. Once gangs had been driven out and eliminated, loyalist forces and police were then to take over the area, with military support brought in thereafter only to conduct any required pacification operations. After their successful dispersion and containment, Erskine went after the forest fighters' source of supplies, money and recruits, i.e. the native Kenyan population of Nairobi. This took the form of Operation Anvil, which commenced on 24 April 1954. By 1954, Nairobi was regarded as the nerve centre of Mau Mau operations. Anvil was the ambitious
Mau Mau Uprising archival material was finally brought to light, while yet more was discovered to be missing. The files, known as "migrated archives", provided details of British human rights abuses (torture, rape, execution) in its former colonies during the final stages of empire, including during Mau Mau, and even after decolonisation. Regarding the Mau Mau Uprising, the records included confirmation of "the extent of the violence inflicted on suspected Mau Mau rebels" in British detention camps documented in Caroline Elkins' study. Numerous allegations of murder and rape by British military personnel are recorded in the files, including an incident where a native