The Jeju events was the Jeju people's struggle to break away from the social evils, to gain national independence, to oppose division of Korea imposed by foreign occupation forces, to gain local autonomy from authoritarian tyranny of the central government. Also, it was an armed insurrection against the US occupation forces. The Jeju April 3rd Events were the series of event, Oppression, Uprising and Grand Massacre in which thousands of islanders were killed as a result of armed clashes between civillian groups and US and Korean government forces. It took place over the period from March 1, 1947, when National Police of US Military Government opened fire on six spectators, and April 3, 1948 Uprising to protest against oppression by the police and Northwest Youth and against US and South Korean Government until September 21,1954 after the last guerilla captured and when closed areas of Halla Mountain were reopened to the public.