The road to Elisabethville began with a decolonisation that went wrong. The Congo won independence from Belgium on 30 June 1960, but within days the army mutinied and the state started to unravel. On 11 July 1960 Moise Tshombe declared Katanga, the copper-and-cobalt rich south, an independent state, propped up by Belgian officers, mining money and hired foreign mercenaries. The central government appealed to the United Nations, which on 14 July 1960 created ONUC, the UN Operation in the Congo, to restore order and hold the country together. It grew into the largest UN mission of its era, near twenty thousand troops from many nations, and India became one of the biggest contributors, sending its 99th Infantry Brigade of roughly three thousand men in 1961. Among these units was the 3rd Battalion of the 1st Gorkha Rifles, and with it a young officer named Gurbachan Singh Salaria. Tension built through 1961: the Katangese gendarmerie captured UN officials, ambushed and killed an Indian officer, Major Ajit Singh of the Gorkhas, and threw up roadblocks to cut off scattered UN detachments around Elisabethville. When those roadblocks tightened into a plan to strangle UN headquarters, the peacekeepers had to fight to breathe.