During the Japanese occupation of the Philippines, Igorots fought against Japan. Donald Blackburn's World War II guerrilla force had a strong core of Igorots. A young Igorot woman, Naomi Flores, was an important member of the Miss U Spy Ring. Postwar era On June 18, 1966, Republic Act No. 4695 was enacted to split Mountain Province and create four separate and independent provinces namely Benguet, Ifugao, Kalinga-Apayao, and Mountain Province. Ifugao and Kalinga-Apayao were placed under the jurisdiction of the Cagayan Valley region, with Benguet and Mountain Province placed under the Ilocos Region. Martial law After the declaration of Martial law by Ferdinand Marcos in 1972, the region became the focus of militarization as a result of local objections to the government's push for the Chico River Dam Project near Sadanga, Mountain Province and Tinglayan, Kalinga. Frustrated by the project delays caused by the opposition, Ferdinand Marcos issued Presidential Decree no. 848 in December 1975, constituting the municipalities of Lubuagan, Tinglayan, Tanudan, and Pasil into a "Kalinga Special Development Region" (KSDR), in an effort to neutralize opposition to the Chico IV dam. Empowered by Martial Law to conduct warrantless arrests, the 60th PC Brigade had arrested at least 150 locals by April 1977, accusing them of supposed subversion and of obstructing government projects, and various other offenses such as boycotting the October 1976 Constitutional Referendum. Individuals arrested included tribal papangat (leaders/elders), young couples, and in at least one case, a 12-year-old child. By December 1978, parts of the Chico IV area had been declared "free fire zones", no-man's-land areas where the army could freely fire on any animals or permit-less humans at will. On April 24, 1980, Marcos-controlled military forces assassinated Macli-ing Dulag, a pangat (leader) of the Butbut tribe of Kalinga. The assassination became a watershed moment, marking the first time the mainstream Philippine press could be openly critical against Marcos and the military, and building up a sense of Igorot identity that eventually led to Cordillera autonomy. Mount Data Peace Accord After the end of the Marcos administration due to the 1986 People Power Revolution, the succeeding government under President Corazon Aquino secured a ceasefire with the main indigenous armed group in the Cordilleras, the Cordillera People's Liberation Army led by Conrado Balweg. The Aquino government made a sipat or indigenous treaty, which would be known as the Mount Data Peace Accord, with the CPLA on September 13,