http://www.newworldencyclopedia.org/entry/March_First_Movement The March First Movement, or the Samil Movement (in Korean, samil means "three-one" or "March 1") was one of the earliest manifestations of Korea's independence movement during the Japanese occupation of Korea. The name refers to an event that occurred on March 1, 1919, also referred to as the Mansei Demonstrations ("ten thousand years," in Korean). The March First demonstrations established the high-water mark in Korea's struggle for independence from the Japanese colonial government. Although the nationwide demonstrations failed to accomplish the goal of effecting independence, they unified the Korean people in spirit as they awaited their eventual liberation from Japan.

https://en.wikipedia.org/wiki/March_1st_Movement