Two other cities were important but not crucial: Diu and Hormuz. Diu controlled the Gulf of Cambay and the Arabian Sea approaches and Hormuz was the keystone of the Persian Gulf trade, both between Persia and Arabia and between Mesopotamia and the Arabian Sea. If both Diu and Hormuz fell, that would prevent the Middle East markets from being taxed by Portugal which would deny Lisbon the revenue from the southernmost course of the Silk Route. This was a lucrative trade but not as essential to the Indian Ocean network at large. After the fall of Hormuz to the English and Dutch, the Portuguese striking out of their Muscat and Goa bases, led a destructive campaign against Persia's coastline and allied with the Basrah Ottomans. Eventually, after the Battle of the three islands Persia vied for a cease-fire with the Portuguese to be able to reestablish trade and provided Portugal with a tradepost in Kong. Together with the reestablished Basrah route, this temporarily made up for the loss of Hormuz.