Jeju uprising to Jeju from Busan and deploying police companies, each 1,700 strong, from the southern provinces of the mainland. The guerrillas retreated to their bases in the forests and caves around Hallasan, an extinct volcano and the highest mountain in South Korea. On April 29, the Korean, non-military, governor of Jeju province abandoned his post, defected, and joined the guerrillas. This caused many police officers, disillusioned by the atrocities they were ordered to commit against their own, to do the same. In response, U.S. military provincial governor William F. Dean ordered a purge of SKLP sympathizers from the ranks of the
Roccamonfina (volcano) with an explosive eruption, including eruptions from the former caldera. This phase continued until some 285,000 years ago. The formation of the volcano also modified the course of the Garigliano and Volturno rivers. The Volturno moved southwest in what is its current course; the Garigliano no longer reached the sea, and formed a lake (Lake Lirino) until (around 200,000 years ago) it eroded rocks near Suio and assumed the current course. Roccamonfina (volcano) The Volcano of Roccamonfina is an extinct volcano in Roccamonfina, Campania, southern Italy. It was active from some 650,000 to 50,000 years ago. It comprises an isolated