In January 1586, a Turkish privateer named Mir Ali Beg sailed from Mocha in Yemen to the Horn of Africa, intending to disrupt Portuguese shipping in the region.Despite the numerical strength of the Portuguese fleet, Ruy Gonçalves da Câmara failed to catch any ship in four months and withdrew to Muscat afflicted by thirst in 1586,[8] The failed attack on the red sea discouraged the Portuguese from launching more expeditions as demonstrated in Philip's letter to the Viceroy of Goa:[8] Since in these parts [i.e. Europe] there are many affairs deserving of attention, it will from now on be necessary for you to preserve the gains that have already been made rather than seek out new ventures.Keep in mind that offensive wars have many disadvantages, as has been demonstrated by the armada which you sent under Ruy Gonsalves da Camara to the Red Sea which, far from resulting in any of the successes that had been hoped for, served only to provoke the Turks at great and unprofitable expense and with much discredit to the state..When news reached Goa that a Turkish fleet was in East Africa inciting cities to rebel and raid Portuguese ships with Ottoman support, the Portuguese reacted swiftly.[13] Calling first at Mogadishu, Mir Ali Beg now extracted a heavy tribute from the cities along the coast in exchange for protection, in the name of the Ottoman Empire.[16] Before Mir Ali Beg had even set sail, already Vasconcelos had dispatched a vessel to Goa informing the viceroy that the Turks were about to leave the Red Sea.[3][18] In late February 1589 the fleet reached the east-African coast, and calling at Lamu, they learnt from an envoy of de Vasconcelos that Mir Ali Beg had established a stronghold at Mombasa.The Portuguese captain of the East African coast, Mateus Mendes de Vasconcelos, was detached with a squadron to remain at Malindi and defend it from the marauding Zimbas.[24] Analyzing the conflict in detail, Czech historian Svat Soucek argued against the exaggeration of the capacity of the Ottoman Empire to expand their influence in the Indian Ocean by certain authors: Mir Ali Beg only managed to pass undetected by the Portuguese intelligence network due to the insignificance of his initial single galley; once he was detected, a Portuguese war fleet was swiftly dispatched to neutralize the threat.
Portuguese galleons, carracks, and oarships depicted by Dom João de Castro in 1540.