The Republic of China Army was founded as the National Revolutionary Army, the armed wing of Sun Yat-sen's Kuomintang (KMT) in 1924. It participated in the Northern Expedition, the Second Sino-Japanese War (during World War II) and the Chinese Civil War before withdrawing with the ROC government to Taiwan in 1949. After 1949, the ROC Army has participated in combat operations on Kinmen and the Dachen Archipelago against the PLA in the Battle of Kuningtou, and in the First and Second Taiwan Strait Crisis. In addition to these major conflicts, ROCA commandos were regularly sent to raid the Fujian and Guangdong coasts. Until the 1970s, the stated mission of the Army was to retake the mainland from the People's Republic of China. Following the lifting of martial law in 1988 and Taiwanese democratization of the 1990s, the mission of the ROC Army has been shifted to the defense of Taiwan, Penghu (the Pescadores Islands), Kinmen and Matsu from a PLA invasion.