Latest / The History of Portugal: The Small Nation That Built a Global Empire — Fexingo History / The Battle of Diu That Made Portugal Master of the Indian Ocean
Transcript
- Lucas: So, we've covered the early voyages, Prince Henry and the African coast, and even the battle of Ceuta. But there's one naval clash that really sealed Portugal's dominance in the Indian Ocean — and it's not as famous as it should be. I'm talking about the Battle of Diu, fought in 1509. Luna: Diu — that's off the coast of Gujarat, right? I've heard the name, but I'm hazy on the details. Lucas: Exactly. By 1505, Portugal had established a foothold in India under the first viceroy, Francisco de Almeida. But their position was precarious. The local powers — especially the Zamorin of Calicut and the Sultan of Gujarat — were furious about Portuguese interference in the spice trade. And they had a powerful ally: the Mamluk Sultanate of Egypt, which controlled the Red Sea route and saw its own trade drying up as Portuguese ships started bypassing it. Luna: So the Mamluks decided to fight back? Lucas: Yes. In 1507, the Mamluk Sultan Al-Ashraf Qansuh al-Ghawri sent a fleet under one of his admirals, Hussein al-Kurdi, to the Indian Ocean. The Mamluks didn't have a strong naval tradition, so they enlisted help from the Ottomans and the Republic of Venice — who were also worried about Portuguese competition. They built a large fleet in Suez, with ships that could carry heavy bronze cannons. Then they sailed down the Red Sea, around the Horn of Africa, and reached the Gujarati port of Diu, where they allied with the local sultan, Malik Ayyaz. Luna: That sounds like a formidable coalition. Lucas: It was. The combined Mamluk-Gujarati fleet had around 200 ships, including large dhows and some Ottoman-style galleys. Against them, Almeida had only about 18 ships — but they were mostly carracks and caravels, with a crucial advantage in firepower and maneuverability. Plus, Almeida was a seasoned commander who had learned from earlier encounters. He knew the local waters and had a network of informants, especially from the friendly kingdom of Cochin, which was a rival of Calicut. Luna: So what was Almeida's strategy? Lucas: He didn't rush into battle. First, he blockaded the port of Diu, cutting off supplies. Then, when the allied fleet finally came out to fight on February 3, 1509, he used a classic Portuguese tactic: the line of fire. His ships formed a line and pounded the enemy with broadsides from their heavy cannons. The Mamluks and Gujaratis were used to boarding actions and close-quarters fighting, but they couldn't get close enough. Their own cannon fire was less effective, and their ships — many of them dhows with single masts — were outclassed. Luna: So it was a one-sided battle? Lucas: Not entirely. The fighting was fierce, and the Portuguese had to repel several boarding attempts. But once the Mamluk flagship was sunk, the allied fleet lost heart. The result was a decisive Portuguese victory: almost the entire enemy fleet was destroyed, and Diu surrendered. Almeida forbade his men from looting the city, but he did impose a heavy tribute. The battle effectively ended organized resistance to Portuguese naval dominance in the Indian Ocean for decades. Luna: And this is what allowed Portugal to control the spice trade, right? Lucas: Exactly. After Diu, the Portuguese were able to establish a network of fortified trading posts — or feitorias — from East Africa to Malacca. They could now enforce a system of cartazes, or naval passes, requiring all ships to call at Portuguese ports and pay duties. It was the beginning of a maritime empire that would last over a century. Interestingly, Almeida didn't live long to enjoy the victory. On his way back to Portugal, he was killed in a skirmish with the Khoikhoi near the Cape of Good Hope. His rival, Afonso de Albuquerque, took over and expanded the empire further. Luna: That's a dramatic end for such a victorious commander. Lucas: It is. But the Battle of Diu itself is often overlooked in the broader narrative of the Age of Discovery. In many ways, it was as significant as the Battle of Lepanto later in the century, because it shifted the balance of power in the Indian Ocean from Islamic maritime states to European ones. Without Diu, Portugal might never have become the global empire it did. Luna: I'm surprised I'd never heard the details before. Lucas: It's one of those battles that isn't taught much outside of Portugal, but it really shaped world history. And the aftermath is fascinating too. The Mamluks were so weakened by the loss that they couldn't resist the Ottoman conquest a few years later. So Diu even indirectly contributed to the fall of the Mamluk Sultanate. It's a perfect example of how a single naval battle can have ripple effects across continents. Luna: And what about the local Gujarati ruler, Malik Ayyaz? What happened to him? Lucas: Malik Ayyaz survived the battle and remained the governor of Diu under the Gujarat Sultanate, but he had to accept Portuguese suzerainty. He actually became a useful ally for the Portuguese, which shows how pragmatic they could be. For a while, Diu became a joint Portuguese-Gujarati port, but eventually, the Portuguese took full control and built the famous fort there. Luna: That fort is still standing, isn't it? Lucas: It is. The Fort of Diu is a major tourist attraction today, with its massive walls and Portuguese architecture. It's a tangible reminder of that era. But the battle itself is commemorated in Portugal too. There's a famous painting in the National Museum of Ancient Art in Lisbon, showing the clash in dramatic detail. Luna: I'll have to look that up. Thanks for sharing this story — I feel like I understand so much more about how Portugal actually built its empire. Lucas: Glad to hear it. And next time, we might talk about the man who succeeded Almeida, Afonso de Albuquerque, who took the empire to its peak. But that's for another episode.