The Ottoman Siege of Vienna Is Broken

On 14 July 1683, an Ottoman army commanded by Grand Vizier Merzifonlu Kara Mustafa Pasha surrounded the Habsburg capital of Vienna, beginning a two-month siege. Capturing the city had long stood as a strategic Ottoman goal because of Vienna's position along the Danube and the main trade routes connecting Germany to the eastern Mediterranean. Emperor Leopold I evacuated the city for Passau alongside tens of thousands of residents, leaving Count Ernst Rüdiger von Starhemberg to direct the defense with a garrison of about 11,000 regular soldiers, along with several thousand armed citizens and local volunteers.

The attackers dug zigzagging trench lines and launched intensive subterranean mining operations beneath the fortifications, seeking to detonate large deposits of gunpowder under the bastions. The defenders attempted to counter the threat by excavating intercepting tunnels and driving timber palisades into the ground to reinforce the crumbling perimeter. By early September, Ottoman sappers had breached sections of the outer walls and captured the Burg ravelin. Starhemberg faced mounting casualties, exhausted provisions, and widespread disease, forcing the surviving defenders to construct barricades within the inner city in anticipation of a final breakthrough.