 During the same year, Amirmachmud would join his troops in a crackdown on the Communist Party of Indonesia (PKI) at Madiun.In 1949, with the Dutch beginning to withdraw from Indonesia, Amirmachmud and his troops returned to West Java.There, Amirmachmud would be involved in skirmishes against the Darul Islam movement, a separatist group who wanted to establish a theocratic Indonesia under the religion of Islam.