How Prince Eugene of Savoy gambled everything to seize Belgrade in 1717
Facing a massive relief army and a fortified city, Prince Eugene of Savoy found his troops trapped in a deadly crossfire. With his men suffering from malaria and dwindling supplies, he made a desperate, high-stakes choice: a surprise night attack that would either secure Belgrade or lead to his own destruction.
The Austro-Turkish War of 1716–1718 was born from the Ottoman Empire's desire to reverse the territorial losses of the 1699 Treaty of Karlowitz. After initial successes against Russia and Venice, the Ottomans declared war on the Habsburgs in April 1716. Prince Eugene of Savoy quickly countered, securing victories at Petrovaradin and conquering Temesvár. By June 1717, Eugene had surrounded Belgrade, constructing a massive 16-kilometer line of fortifications to besiege the city while simultaneously protecting his rear from an approaching Ottoman relief force.
The situation turned dire as the relief army, commanded by Grand Vizier Halil Pasha, arrived in July 1717. With 140,000 Ottoman soldiers against his own 60,000, Eugene was caught in a dangerous pincer. Disease and constant bombardment further weakened his position. However, a lucky strike on 14 August—when a mortar shell hit an ammunition store inside Belgrade, killing 3,000 defenders—provided the opening Eugene needed. He ordered a surprise assault for the night of 15 August, navigating his troops through a thick, disorienting fog that obscured the battlefield.
The ensuing battle was a chaotic, ten-hour struggle. Despite initial confusion and the loss of order in his cavalry wings, Eugene personally led his reserves in a decisive counterattack against the Ottoman janissaries. The Ottomans suffered up to 20,000 casualties and lost all 166 of their artillery pieces. Belgrade surrendered on 21 August, marking the end of 196 years of Ottoman rule in the city. The subsequent 1718 Treaty of Passarowitz solidified Habsburg control over Belgrade, the Banat of Temesvár, and parts of Serbia, representing the monarchy's maximum territorial expansion in the Balkans.
This victory effectively ended Ottoman hopes for further expansion into Europe, shifting their strategy toward merely holding existing borders. For Prince Eugene, the triumph at Belgrade was the pinnacle of his military career. He retired shortly after, having secured a legacy as one of the most successful commanders of his era. The Habsburgs held the city until 1739, when renewed conflict saw it return to Ottoman hands.
Source: Austro-Turkish War (1716–1718)
