Mau Mau Uprising 'Our Grandfathers' (—Twenda kwikala ta maau mau maitu, tuithye ngombe to Maau mau maitu, nundu nthi ino ni ya maau mau maitu). Some have argued that it is an acronym for "Mzungu Aende Ulaya Mwafrica Apate Uhuru". Others have claimed that it was coined from the term "UMA UMA", a communication code used by the guerrillas. Dominated by the Kikuyu people, Meru people and Embu people, the "Mau Mau" also comprised units of Kamba and Maasai peoples who fought against the white European colonist-settlers in Kenya, the British Army, and the local Kenya Regiment (British colonists, local auxiliary militia, and
Operation Anvil (Mau Mau Uprising) in the process. Erskine intended on relocating all Kikuyu, Embu, and Meru people from Nairobi, but the colonial government rejected the plan, citing potential harm to the local economy and administration. The operation was based on one British security forces had conducted in Tel Aviv, Palestine. Its legality was assured by the Emergency Regulations and the Control of Nairobi Regulations of 1954, the latter of which permitted the colonial governor to issue "Evacuation Orders" to remove and detain individuals from the city so they could be screened for connections with the Mau Mau. Four battalions were earmarked for the action.