While matters of the battle of Mohács, of the 17th-century anti-Habsburg movements, or of the reconquest are well-studied for the their role, importance and effects on later periods or Hungarian history (their historiography being also revisited from time to time), the Long Turkish War lacks this attention. European and international academic public has especially little awareness to the struggle between the Ottoman Empire and the Habsburg Monarchy taking place during the turn of the 16th¿17th centuries. However, the amount of available sources today does enable us to examine events and their background from similar perspectives as in the case of the Thirty Years¿ War. During my two-decade-long research, my emphasis has always been on the why, instead of how, striving for answers about motives and dependencies of the events. This is what inspired my idea to publish the so far accumulated research results in foreign languages as well. The volume discusses the history of the war in two larger sections, providing a cross-section of the events and mostly their background: the organization of the Christian armies and the parameters of the war.