Latest / The Rise of Colonialism: How Europe Divided the World — Fexingo History / The Siege of Diu 1538 Ottoman Challenge to Portuguese India
Transcript
- Lucas: So we've talked a lot about how the Portuguese built their empire in Asia — the conquest of Goa, the seizure of Malacca, the monopoly over the spice trade. But we haven't really looked at the moment when it almost fell apart. Luna: I thought they were pretty dominant after Albuquerque. Lucas: They were, for a while. But by the 1530s, a new threat emerged — not from local kingdoms, but from the Ottoman Empire. And it culminated in a single, brutal siege: the Siege of Diu in 1538. Lucas: Diu is a small island off the coast of Gujarat, in western India. The Portuguese had taken it in 1535, not through conquest but by a treaty with the local sultan, Bahadur Shah. Bahadur Shah was under pressure from the Mughals and needed Portuguese naval support, so he ceded Diu as a kind of payment. Luna: Wait, so they just gave them an island? Lucas: Not exactly given — it was more like a lease with conditions. But within months, Bahadur Shah regretted it. He tried to take Diu back, but the Portuguese refused. Then things got complicated. Bahadur Shah started negotiating with the Ottomans, who were expanding into the Indian Ocean. And in 1537, while he was meeting with Portuguese officials, he was killed in a scuffle. The Portuguese were blamed, though it might have been an accident. Lucas: That gave the Ottomans a perfect casus belli. Suleiman the Magnificent, at the height of his power, sent a massive fleet commanded by his governor of Egypt, Hadım Suleiman Pasha. And I want to emphasize: this wasn't just a raid. This was a full-scale expedition with over 70 ships and perhaps 15,000 men. Luna: That's enormous for the Indian Ocean at the time. Lucas: It was. And the target was Diu, because without Diu, the Portuguese would lose their stranglehold on the trade routes between India and the Red Sea. The Ottoman fleet arrived in September 1538 and immediately laid siege to the fortress. Lucas: The Portuguese garrison was tiny — about 600 Portuguese soldiers plus a few hundred local auxiliaries, mostly Malabari and Gujarati mercenaries. The commander was Martim Afonso de Sousa, and the captain of the fortress was João de Castro, who later became a legendary viceroy. But they were vastly outnumbered. Luna: How did they hold out? Lucas: A combination of factors. First, the fortress itself was modern — built with angled bastions to withstand cannon fire. Second, the Portuguese had very skilled gunners, including some Venetian renegades who knew Ottoman tactics. And third, the Ottomans made a critical mistake: they didn't blockade the harbor completely, so the Portuguese could still get supplies by sea. Lucas: The siege lasted about a month. The Ottomans bombarded the walls, tried to mine them, even attempted a night assault. But each time, the Portuguese held. And then, in October, a Portuguese relief fleet arrived from Goa — about 20 ships under the command of the viceroy himself, Garcia de Noronha. The Ottomans, caught between the fortress and the relief fleet, lifted the siege and withdrew. Luna: So the Portuguese won decisively. Lucas: Yes, but it was close. And the aftermath was significant. The Ottomans never again attempted a major campaign in India. The Portuguese, emboldened, tightened their control over Diu and the surrounding region. But the siege also exposed the limits of Portuguese power — they could win a defensive battle, but they couldn't project force deep inland. And it marked the beginning of a long, low-intensity conflict between the Portuguese and the Ottomans in the Indian Ocean that would last for decades. Luna: So the Ottomans just gave up on India after that? Lucas: Not entirely. They continued to support anti-Portuguese forces in the region, like the sultanate of Aceh in Sumatra. But they never again sent a fleet of that size so far from home. The Siege of Diu was a turning point — it confirmed that the Portuguese would remain the dominant European power in Asia for another century, but it also showed that their hold was fragile, dependent on a few key fortresses and the cooperation of local elites. Luna: And what happened to Bahadur Shah? Did his death ever get justice? Lucas: Not really. The Portuguese claimed it was an accident during a scuffle, but many in Gujarat believed it was murder. His nephew, Mahmud Shah, succeeded him but was a puppet of the Portuguese. So the end result was that the Portuguese got Diu permanently, and Gujarat became a satellite state. It's a classic story of how European empires exploited local rivalries and then turned on their allies. Lucas: And if you want to see the legacy of the siege, you can visit Diu today. The fortress still stands, with its Portuguese cannons facing the sea. It's a quiet tourist spot now, but in 1538, it was the scene of one of the most critical battles in the history of European colonialism. Luna: It's amazing how a single small island could decide the fate of an empire. Lucas: Absolutely. That's the nature of early colonialism — a few key locations, a few decisive moments, and the whole balance of power shifts. The Siege of Diu is one of those moments that doesn't get talked about much, but it's essential to understanding how Europe came to dominate the world.