The book aims to offer an outline of the Ottoman-Russo-Austro War in 1736-1739 and also attempts to portray the Bosnia Frontier, an important subregion the Austro-Ottoman war. To provide a more detailed understanding of the Bosnian frontier, the original transcription of Ömer of Novi's Ahvâl-i Gazavât Der Diyâr-_ Bosna (History of the War in Bosnia During the Years 1737-8 and 9) was included as a primary source in the study. Additionally, the main sources as Ottoman Archive documents and Ottoman manuscripts were used in the work.