How a desperate naval blockade turned the tide for Venice in 1380
The War of Chioggia nearly destroyed Venice, but a daring tactical maneuver saved the republic. By sinking stone-laden ships to trap the Genoese fleet within the Venetian lagoon, the Venetians transformed a near-total defeat into a decisive victory, effectively ending the centuries-long rivalry between the two great maritime powers.
Fought between 1378 and 1381, the War of Chioggia was the final major confrontation between the Republics of Venice and Genoa. Genoa sought to eliminate Venetian competition in the Black Sea to secure a monopoly on trade, particularly after the collapse of Mongol hegemony made Central Asian routes less profitable. The conflict was fueled by complex alliances, with Genoa supported by Hungary, Padua, and the Patriarch of Aquileia, while Venice relied on its internal organization and the leadership of admirals like Vettor Pisani and Carlo Zeno.
The war reached a critical point in August 1379 when Genoese forces captured the town of Chioggia, encircling Venice. With the city facing potential ruin, the Venetian Senate mobilized all reserves and released the imprisoned Admiral Pisani. In a brilliant counter-move on the night of 22 December 1379, Pisani and Doge Andrea Contarini blockaded the Genoese inside the lagoon by sinking ships filled with stones in the channels. This trapped the invaders in a cul-de-sac, turning their own position into a prison.
The blockade held through months of skirmishes until the Genoese, near starvation, surrendered on 24 June 1380. The subsequent Treaty of Turin in 1381 formally ended the hostilities. While the war caused enormous economic damage to both sides, it permanently crippled Genoa's naval ascendancy. Venice recovered its strength, and the two republics eventually divided their commercial interests, with Venice dominating the Adriatic and Ionian seas while Genoa focused on the Black Sea and Aegean regions.
Notably, this conflict marked the first recorded use of shipborne cannons in support of amphibious assaults. The war's legacy persists in the annual Palio della Marciliana in Chioggia, which commemorates the events that reshaped Mediterranean power dynamics. Although both republics were nearly destroyed, Venice’s ability to endure the siege and reorganize allowed it to maintain its status as a leading maritime power for over a century.
Source: War of Chioggia
