Defining terrorism is difficult, and there are more than one hundred definitions of it in scholarly literature. The term is used in polemical contexts, thus it can become a move in a campaign rather than an aid to thought. A simple definition would be "use of force against innocent people for political purposes". Some scholars argue that there is no true or correct definition due to terrorism being an abstract concept without a real presence. Legal definitions contain internal contradictions and might be misused. There is an overlap between terrorism and various other forms of conflict and violent action, including civil wars or non-international armed conflicts. This is the case with several significant non-international conflicts in Europe, where there thus can be dispute as to what counts as terrorism: examples include the Irish War of Independence (1919–21), the breakup of Yugoslavia and subsequent conflicts, the First (1994–6) and Second Chechen Wars (1999–2009), and the War of Dagestan (1999).