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In 1739, weak Austria requested peace with the Ottomans, after they joined the Russians in their war althogh they weren't required to do so. Furthermore, the Russians had had some success. It's been Austrian weakness that lost them the war after decades of Austrian greatness under Prince Eugen.
In this treaty, the Austrians lost Belgrade and Northern Serbia as well as the Western part of Wallachia. The frontier drawn in that peace was essentially the Austrian southern frontier until the annexation of Bosnia 1908. So what if the Austrians did win? What if they got further parts of Serbia or Bosnia?