The Siege of Candia, or what we now call Heraklion on the island of Crete in Greece, was almost unimaginable in its duration. For more than two decades, war raged across Crete, settling into something like daily life for those who endured it.
Back in 1645, when Ottoman Empire forces first set foot on the island, few could have predicted how events would unfold. Crete held immense strategic importance for the major European powers of the time. The Republic of Venice relied on territories like it to maintain its fragile network of influence across the Mediterranean—like pins on a map holding everything in place. Once those pins began to fall, the system unraveled quickly.
And unravel it did. Much of Crete succumbed relatively fast. Candia, however, proved to be another story entirely. The siege was not a single, continuous assault but a prolonged and evolving conflict, marked by shifting strategies, reinforcements, and changing momentum between two powerful empires: the Ottoman Empire and the Republic of Venice.
In its early phase after 1648, the Ottomans relied heavily on traditional siege tactics such as encirclement, sustained artillery bombardment, and repeated infantry assaults designed to overwhelm the city’s defenses. Yet Candia’s formidable fortifications forced them to adapt. It became clear that this was no ordinary city. Direct attacks proved costly and largely ineffective, pushing Ottoman forces toward more methodical approaches, including trench warfare and extensive mining operations.
The Ottomans did not act alone. Troops were drawn from across their vast empire, including elite Janissaries and highly skilled military engineers. On the opposing side, Venice turned Candia into the focal point of what might be described as a broader European resistance. Reinforcements arrived not only from Venice but from across the continent—French, Spanish, Maltese, and Papal forces, alongside local Greeks, descendants of the long-fallen Byzantine Empire. Together, they formed a loose but determined coalition resisting Ottoman expansion.
Naval warfare played a crucial role throughout the siege. The Venetians, long dominant at sea, worked to maintain supply lines to the city while disrupting Ottoman logistics. Major naval engagements unfolded around Crete and in the Dardanelles, as Venice attempted to block reinforcements traveling from Constantinople (now Istanbul) to the island. At times, these efforts delayed Ottoman progress and prolonged the siege, but they never succeeded in breaking it entirely.
As the years wore on, the conflict became increasingly technical and attritional. Mining and counter-mining turned large stretches of ground into unstable, deadly terrain, while artillery grew ever more precise and destructive. Disease and exhaustion claimed as many lives as combat itself. Commanders came and went, each attempting new strategies to break the stalemate.
By the final years of the 1660s, the balance had begun to shift decisively. The Ottomans committed greater resources and manpower, while Venetian support from Europe gradually waned. In 1669, after a devastating final phase, the Venetian commander Francesco Morosini negotiated the surrender of the city, bringing one of the longest sieges in history to its end.
How Candia (Heraklion) of Crete withstood such a siege
Candia (later renamed Heraklion as it continues to be called) wasn’t just any stronghold. The Venetians had invested heavily in its defenses—and wisely so. The city boasted cutting-edge fortifications for its time: low, angled walls designed to absorb artillery fire instead of shattering under it.
So when the Ottomans finally encircled the city in 1648, they ran into a problem: Candia refused to fall. At first, it wasn’t surprising. Strong cities resist. That’s what they do. However, weeks became months, months stretched into years, and the siege settled into something much harder to define. Imagine growing up in a place where war is just… normal.
Inside Candia, the inhabitants adapted because they had no choice. Supplies came in by sea, barely, and never reliably—but enough to keep the city alive. That tenuous lifeline made all the difference. Without it, Candia would have collapsed far sooner. Still, survival came at a cost. Food shortages, disease, and relentless stress were constant companions. And then there was the noise. Artillery booming somewhere in the distance—sometimes frighteningly close. Outside the walls, Ottoman forces shifted tactics continuously, inching closer with trenches until they went underground.
That subterranean war was especially grim. Both sides tunneled beneath the city’s defenses—one to plant explosives, the other to thwart them. It was a hidden conflict, silent and invisible, broken only by the scraping of shovels and the sudden, terrifying explosion. Walls vanished in seconds and so did the men defending them.
What truly sets the Siege of Candia on Crete apart wasn’t only its extraordinary length. It was its relentlessness. There was no real pause and no clear break between “battle” and “rest.” The pressure endured year after year. Children were born into it; if you were twenty when the siege ended, you had spent your entire life inside a city at war.
That experience reshapes people profoundly. It warps what “normal” even means. Historians often frame Candia as a turning point, a moment when traditional warfare gave way to something more modern, more brutal, and more systematic—and that is true in the broadest sense. But inside the city, it was simply pure hell disguised as everyday life. An entire generation grew up focused only on getting through each day.
How the whole ordeal ended
In 1669, after more than two decades, Candia finally fell to the Ottomans. Venice lost Crete—and with it, a significant portion of its influence in the Eastern Mediterranean. On paper, that was the conclusion. But this siege was like no other. It outlasted childhoods, reshaped entire lives, and blurred the line between wartime and everyday existence.
If you visit Heraklion on Crete today, the old Venetian walls remain. They are unassuming. There are no dramatic ruins, no frozen chaos, and no obvious scars demanding attention. All there is is stone, worn smooth by time. And yet, once you know the story, it is impossible to look at them the same way. Those walls held for years longer than anyone could reasonably expect.
That is why Candia of Crete and its siege still captivate historians and history enthusiasts alike. It is not simply because it was long, strategically vital, or tied to the rise and fall of empires but because it reveals what human ingenuity looks like when stretched to its absolute limits—ordinary people facing a situation that was neither heroic in the usual cinematic sense nor tidy, yet enduring until, eventually, it ended.
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