The violent massacre of the Malay sultans, local rulers, intellectuals, and politicians by the Imperial Japanese Army during the Pontianak incidents of 1943–1944 in West Borneo (present-day West Kalimantan province) created a social opportunity for the Dayak people in the West Kalimantan political and administrative system during the Orde Lama era of Sukarno, as a generation of predominantly Malay administrator in West Borneo was lost during the genocide perpetrated by the Japanese. The Dayak ruling elite was mostly left unscratched due to the fact that they were then mainly located in the hinterland and because the Japanese were not interested, thus giving an advantage for the Dayak leaders to fill the administrative and political position after the Indonesian independence. Cretion of Central Kalimantan province was pushed by Dayak militia Mandau Talawang Pancasila. The militia also on the other hand helped government to fight Islamist rebellion in South Kalimantan.