Latest / The History of Portugal: The Small Nation That Built a Global Empire — Fexingo History / The Siege of Diu 1546: Portugal's Last Stand in India
Transcript
- Lucas: So last time we talked about the first Siege of Diu in 1538, when an Ottoman fleet tried and failed to capture the Portuguese stronghold. Well, the Ottomans and their Gujarati allies didn't give up. Just eight years later, they tried again — and this time it was much, much worse. Luna: The Second Siege of Diu? I've read it was one of the most desperate defenses in Portuguese colonial history. Lucas: Exactly. In 1546, the new Sultan of Gujarat, Mahmud Shah III, allied once again with the Ottoman Empire. They assembled a massive force — some accounts say 12,000 to 15,000 men, with hundreds of cannons, including huge siege guns that could batter stone walls. The Portuguese garrison at Diu was tiny: maybe 600 to 800 soldiers, plus a few hundred local auxiliaries and civilians. The commander was Dom João Mascarenhas, a veteran officer who knew the stakes. Luna: And the Ottoman commander was Khadim Suleiman Pasha again? Lucas: Not this time. Suleiman Pasha had been disgraced after the 1538 failure. The Ottoman forces were led by a different admiral, but the real mastermind on the ground was a renegade European — Rumi Khan, a former Ottoman artillery expert who had switched sides and now served the Sultan of Gujarat. He was a brilliant siege engineer, and he had learned Portuguese tactics from the inside. Luna: That's terrifying — having an enemy who knows exactly how you fight. Lucas: It was. Rumi Khan set up his batteries on the peninsula opposite Diu fortress and began a systematic bombardment. He also dug trenches and mines, trying to undermine the walls. The Portuguese defenders were outnumbered at least ten to one, and they were running low on food, water, and ammunition. Mascarenhas sent desperate pleas for help to the Viceroy in Goa, Dom João de Castro. Luna: Did de Castro come? Lucas: He was already preparing a relief fleet, but the monsoon made sailing impossible for months. So the garrison had to hold out on its own. And they did — partly because of extraordinary leadership, and partly because of sheer desperation. One story that stands out is about a nun named Isabel Madeira. When a breach was made in the walls and the enemy surged in, she grabbed a sword and rallied the defenders, fighting alongside the soldiers. She became a symbol of Portuguese resistance. Luna: A nun fighting in the breach — that's incredible. Did she survive? Lucas: She did. She was later honored by the king. But the siege dragged on for months. The defenders held out through constant bombardment, repeated assaults, and disease. They even sent out sorties to spike enemy guns. And finally, in November 1546, Dom João de Castro's fleet arrived — 90 ships and 4,000 men. The besiegers, caught between the fortress and the relief force, broke and fled. The siege was over. Luna: So Diu remained Portuguese. But what was the cost? Lucas: Enormous. The fortress was a ruin, the garrison was decimated, and the city of Diu itself was destroyed. But the victory cemented Portuguese control over the Gujarati trade routes — especially the vital horse trade from Arabia, which the Portuguese now monopolized. Dom João de Castro became a hero, but he died just a few months later, probably from exhaustion or disease contracted during the campaign. Luna: So it was a pyrrhic victory in some ways. Lucas: In human terms, yes. But strategically, it was decisive. The Ottomans never again challenged Portuguese dominance in the Indian Ocean directly. The Gujarat Sultanate was fatally weakened, and the Portuguese Estado da Índia survived to control the spice routes for another century. The cartaz system — those passes that forced Indian ships to pay for protection — continued to fund the empire. Diu became a symbol of Portuguese determination. Luna: And what about Rumi Khan? Did he escape? Lucas: He was killed during the final assault, or executed afterward — accounts differ. But his engineering skills had nearly broken the Portuguese. It's a reminder that the Portuguese empire in Asia was always fragile, always dependent on just a few fortified harbors and the courage of outnumbered men. The Second Siege of Diu was their finest hour, but it was also a warning: one defeat could have ended everything. Luna: It makes you think about how much of history hangs on moments like that — a handful of people making a stand. Lucas: Absolutely. And it's a story that deserves to be remembered, not just as a Portuguese triumph, but as a human story of endurance against overwhelming odds. Next time, we'll look at how the Portuguese used Diu as a base to project power into the Persian Gulf and the Red Sea — but for now, I think we've given the siege its due.