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 movement throw a stone was accepted as an adequate defence and no charges were laid. A truce was declared on 12 March 1930, after another child was killed by New Zealand marines who were now suffering heat exhaustion and tropical infections. The male Mau members returned to their homes, on the condition that they retain their right to engage in non-cooperation. Meanwhile, Nelson and other exiled leaders continued to lobby the New Zealand Government and communicate their progress to the Mau. In 1931, news of the growing resistance to the British rule of India reached many Samoan villages. The Mau movement