Latest / The History of Portugal: The Small Nation That Built a Global Empire — Fexingo History / The Battle of Diu 1509: How Portugal Won the Indian Ocean
Transcript
- Lucas: So, we've talked a lot about the Portuguese in Asia — their trading posts, their diplomacy, their conflicts. But there's one battle that really deserves its own episode, because it was the moment Portugal proved it could dominate the Indian Ocean. I'm talking about the Battle of Diu, fought on February 3, 1509 — probably the most important naval battle you've never heard of. Luna: Wait, not the 1538 siege we covered? There was an earlier battle? Lucas: Exactly. That was a siege of the fortress decades later. The 1509 battle was an open-ocean fleet engagement, and it was the first time the Portuguese faced a truly combined enemy coalition. By 1508, the Portuguese had already caused chaos in the spice trade. Their policy was simple: control the sea lanes, force every merchant ship to buy a safe-conduct pass called a cartaz, and crush anyone who resisted. The local powers — especially the Zamorin of Calicut, the ruler of the richest pepper port in India — were furious. The Zamorin had been fighting the Portuguese for years, but he couldn't defeat them alone. So he started building a coalition: he reached out to the Mamluk Sultan of Egypt, Qansuh al-Ghuri, and the Ottoman sultan, Bayezid II, with a message: 'Help us drive these Christians out, or they'll come for you next.' Luna: And the Mamluks actually sent a fleet all the way to India? Lucas: They did. It was an incredible logistical feat. The Mamluks had a formidable navy in the Red Sea, but they didn't usually operate in the Indian Ocean proper. Under the command of a veteran admiral named Mirocem — his full name was Amir Husain al-Kurdi — they assembled a fleet of about a dozen large ships, including some Ottoman-style galleys. They also had a contingent of Ottoman volunteers, including gunners who knew how to use the latest cannons. This was a serious threat. Meanwhile, the Sultan of Gujarat, Mahmud Begada, also joined the coalition. Gujarat controlled the port of Diu, which was a major hub for the spice trade and for shipping horses from Arabia to India. The Gujarati fleet was led by a former slave turned admiral named Malik Ayyaz, a very capable commander. So by early 1508, the coalition had gathered at Diu: Mamluks, Ottomans, Gujaratis, and the Zamorin's own ships from Calicut. Luna: That sounds overwhelming. How many ships did the Portuguese have? Lucas: That's the thing — the Portuguese fleet was outnumbered. Francisco de Almeida, the Portuguese Viceroy of India, had about 18 ships, mostly carracks and caravels, with maybe 1,500 men. The combined enemy fleet had around 100 vessels of various sizes, with thousands of men. And they had the advantage of operating near their own bases. But Almeida had a personal reason to seek battle. Just a few months earlier, in June 1508, his son Lourenço de Almeida had been killed in a skirmish near the port of Chaul, when the Mamluk-Gujarati fleet ambushed a small Portuguese patrol. Lourenço was young, popular, and his death devastated his father. Almeida was determined to avenge him. He famously said, 'He who ate the chicken must pay for it, or forfeit the tooth that bit.' He was not in a negotiating mood. Luna: So this was personal for Almeida. But also strategic. Lucas: Absolutely. Almeida knew that if he let this coalition consolidate, the Portuguese position in India would be finished. He had to strike before they could coordinate further. In December 1508, he gathered his fleet at Cochin — the Portuguese ally on the Malabar Coast — and sailed north. He stopped at various ports along the way, picking up supplies and intelligence. By February 2, 1509, he arrived off the coast of Diu. The enemy fleet was anchored in the harbor, protected by the fort of Diu and the guns of the city. But Almeida didn't hesitate. The next morning, February 3, he attacked. Luna: What was the actual battle like? Was it one decisive clash or did it drag on? Lucas: It was actually a single day of brutal fighting. Almeida divided his fleet into three squadrons. One, under his command, went straight for the Mamluk flagship. Another, under Portuguese captains like João da Nova, attacked the Gujarati ships. The third provided covering fire. The Portuguese had a key advantage: their cannons were more advanced and their ships were more maneuverable in the open sea. The enemy fleet was crowded in the harbor, so they struggled to form a proper battle line. The Mamluks and Gujaratis fought hard — there was boarding actions, hand-to-hand combat — but the Portuguese firepower was devastating. By the end of the day, most of the enemy ships were sunk or captured. Mirocem escaped wounded, but Malik Ayyaz surrendered his ship. The Zamorin's contingent was wiped out. The coalition was shattered. Luna: And Almeida got his revenge. Lucas: He did, but it wasn't just personal. The victory had immediate strategic consequences. The Portuguese captured a huge amount of artillery and supplies, and they now controlled the sea lanes to Gujarat. More importantly, the Sultan of Gujarat, Mahmud Begada, was so impressed — or terrified — that he agreed to negotiate. He allowed the Portuguese to build a fortress at Diu, which they later did in 1535. That fortress became one of the linchpins of the Estado da Índia. The Mamluk Sultanate never recovered its naval power in the Indian Ocean. And the Ottomans, though they would try again later, had suffered a major setback. Luna: So Portugal's dominance in the Indian Ocean was really sealed at Diu. Lucas: Exactly. Before 1509, the Portuguese were seen as a nuisance — a bunch of upstart Europeans who had somehow found their way around Africa. After Diu, they were recognized as a major naval power. The battle also had a fascinating political aftermath. Almeida, flush with victory, refused to step down as Viceroy when his replacement, Afonso de Albuquerque, arrived from Portugal with orders to take command. Almeida argued that Albuquerque's commission was invalid because he had not brought the proper papers — or so he claimed. He actually arrested Albuquerque and held him prisoner for months, until a new fleet from Portugal confirmed Albuquerque's authority. It was a bizarre power struggle that nearly derailed the entire Portuguese enterprise. Luna: Wait — so the hero of Diu ended up defying his own king? Lucas: He did. Almeida was a tough, independent-minded old soldier. He believed he had earned the right to continue as Viceroy. But King Manuel I had already decided to replace him with Albuquerque, who had a very different vision. Albuquerque wanted to establish permanent fortresses and a centralized empire; Almeida preferred a more mobile, sea-based strategy. Their rivalry was personal and ideological. Eventually, Almeida was forced to capitulate and sailed for Portugal in 1510. But he never made it home — he was killed in a skirmish with the Khoikhoi people near the Cape of Good Hope. It was a tragic end for a man who had done so much to secure Portugal's position in the East. Luna: So Almeida's victory at Diu was the foundation, but Albuquerque built the empire. Lucas: Perfectly put. The Battle of Diu gave Portugal the breathing room to establish its Estado da Índia. It broke the back of the Muslim naval coalition that could have strangled the Portuguese in their infancy. And it demonstrated that European naval technology and tactics, when used aggressively, could overcome even a much larger enemy. For the next hundred years, the Portuguese would dominate the Indian Ocean, and Diu was the battle that made it possible. So when you look at that little fort on the island of Diu today, remember: a lot of history rests on that one day in 1509.