Operation Anvil (Mau Mau Uprising) the reserves. The "Grey" grade was made up of prisoners believed to be passive Mau Mau sympatherisers though for whom strong evidence suggesting their true loyalties was lacking. The last category, "Black", was reserved for detainees identified by the hooded informers or the Special Branch of the Kenya Police as potentially violent insurgents or terrorists. A few may have been prosecuted by the government, but most were funneled through the "Pipeline", a system of work camps, decreasing in brutality until an individual was "re-educated" and deemed safe to release on a native reserve. Operation Anvil (Mau Mau Uprising) Operation Anvil
Mau Mau Uprising operations against Mau Mau fighters in the forests, the British attempt to defeat the movement broadly came in two stages: the first, relatively limited in scope, came during the period in which they had still failed to accept the seriousness of the revolt; the second came afterwards. During the first stage, the British tried to decapitate the movement by declaring a State of Emergency before arresting 180 alleged Mau Mau leaders (see "Operation Jock Scott" below) and subjecting six of them to a show trial (the Kapenguria Six); the second stage began in earnest in 1954, when they undertook a