Even though terrorism dates back to a very long time, it appears in the literature as a concept after the French Revolution. After the Revolution, the harsh regime process carried out by the administration represented by the Jacobins to ensure effective control over the people was called the "terror period". Terrorism is an old concept that can update itself in the best way. In this sense, modern terrorist organisations have a learning structure that imitates similar structural features, strategies and forms. This study has been prepared to evaluate the transformation of the PKK terrorist organisation, which is the most important terrorist problem of our country, into the classical guerrilla warfare methodology, its similarities and the way it is applied through the Maoist war doctrine, based on the experience of similar insurgencies in the past.