Pol Pot's regime said that “What is rotten must be removed”. Under his leadership, many Cambodians became subject to oppression and cleansing by being sent to an execution ground called “The Killing Fields”. It’s said that more than 1 million people were killed, but because the number is mixed with casualties of Cambodian civil war and the chaos caused by it, it has made it difficult to get census number since 1962, and so the real count is hard to know. Moreover, he built an army of children under age of 14. These children who had been denied education were easier to be brainwashed compared to adults. They were made into troops, security forces and medics. The juvenile troops were especially loyal cold-blooded in duty. However, they weren't so effective against the more experienced and better equipped Vietnamese forces.