Latest / The Rise of Colonialism: How Europe Divided the World — Fexingo History / The Battle of Diu 1509: Portugal Seizes the Indian Ocean
Transcript
- Lucas: So you know how in earlier episodes we talked about the Portuguese setting up feitorias along the Indian coast, and the Carreira da Índia, the annual voyage around Africa. For a while, it was risky but manageable. But by 1509, the whole enterprise nearly collapsed. Luna: Because of the Battle of Diu, right? Lucas: Exactly. The battle itself was a single day, February 3rd, 1509, but the stakes were enormous. The Portuguese had been cutting into the Muslim spice trade that ran through the Red Sea and the Persian Gulf, and the established powers had finally had enough. The Mamluk Sultanate of Egypt, which controlled the Red Sea route, allied with the Sultanate of Gujarat, a major Indian state that controlled the port of Diu, and they got backing from Venice—which was terrified of losing its monopoly on spice distribution in Europe. Lucas: So they assembled a huge fleet: about 100 ships, including massive Mamluk galleys armed with cannons, and a large Gujarati contingent. They were commanded by a Mamluk admiral named Husain al-Kurdi, and on the Gujarati side, the governor of Diu, Malik Ayyaz, who was a former slave turned ruler. Against them, the Portuguese had about 18 ships, mostly carracks and smaller vessels, under the command of Francisco de Almeida, the first viceroy of the Estado da Índia. Luna: That's a huge numerical disadvantage. How did they win? Lucas: A few things. First, Portuguese ships were built for the open ocean, while the Mamluk and Gujarati ships were mostly oar-powered galleys, which were lower and more vulnerable to cannon fire from a distance. Second, the Portuguese had better guns—both in number and quality. Their carracks carried heavy cannons that could sink a galley with a single hit. Third, Almeida was a ruthless and disciplined commander. He had his fleet anchored in a line blocking the harbor of Diu, and he refused to be lured out. Lucas: The battle started with the allied fleet trying to break the Portuguese line. They had some success early on, actually—they managed to board and capture one Portuguese ship. But Almeida's flagship, the Flor do Mar, held firm. Then the Portuguese counterattacked, using their superior maneuverability and firepower to pick off the allied ships one by one. They also used fireships—old vessels filled with combustibles set adrift into the enemy fleet, which caused chaos. Luna: Hmm. So it was a total rout? Lucas: Pretty much. The allied fleet lost most of its ships and thousands of men. Husain al-Kurdi barely escaped. Malik Ayyaz, however, managed to negotiate a surrender that allowed him to stay in power as a Portuguese tributary. But the real impact was strategic: after Diu, no Muslim power in the Indian Ocean could challenge Portuguese naval dominance. The Portuguese could now control the spice trade by force, demanding safe-conduct passes from every ship, and they set up a system of cartazes—licenses that all traders had to buy, essentially a protection racket on the sea. Luna: But didn't the Mamluks try again? Lucas: They did, but they had no real naval capacity left. The Mamluk Sultanate itself was conquered by the Ottoman Empire in 1517, and the Ottomans would later challenge the Portuguese in the Indian Ocean, but never with the same scale. For Portugal, Diu was the moment they went from being a nuisance to being the hegemon. It also made Almeida a legend, though he died only a month later in a skirmish at the Cape of Good Hope. Lucas: One gruesome detail: after the battle, Almeida ordered the execution of many prisoners, including the captured Mamluk sailors. He had them tied to the mouths of cannons and blown apart—a practice that became known as 'blowing from the guns.' It was meant to terrorize the enemy. And it worked. Luna: That's horrific. But it's also a reminder of how brutal colonial warfare was from the very beginning. Lucas: Absolutely. The Battle of Diu is often called the 'Battle of Lepanto of the Indian Ocean,' but it was far more decisive. Lepanto in 1571 checked Ottoman expansion in the Mediterranean; Diu gave Europe a stranglehold on Asian trade for centuries. It's a pivotal moment in the rise of colonialism, and it set the template for how European powers would use naval superiority to carve up the world.