In 1506 he was appointed commander of a fleet of 15 ships sent to the east coast of Africa and off India. His cousin,
Afonso de Albuquerque, was in charge of a squadron of five vessels in this fleet that subsequently detached. Their mission was to conquer
Socotra Island and build a fortress there, hoping to close the trade in the Red Sea. They sailed together until they reached Mozambique. In the
Mozambique Channel they found his friend Captain
João da Nova stranded while returning from India. They rescued him and the ship
Flor de la mar, both joining the fleet. After a series of successful attacks on Arab cities on the east coast of Africa, they headed to Socotra.
Discovery of Tristan da Cunha Archipelago On this voyage Tristão da Cunha discovered a group of remote islands in the south Atlantic Ocean, from South Africa. Although rough seas prevented a landing then, he named the main island after himself, Ilha de Tristão da Cunha, which was later anglicized to
Tristan da Cunha.
Battle of Barawa He then set his eyes on
Ajuran Empire territory, where the
Battle of Barawa was fought. The Portuguese soldiers burned the city and looted it. The inhabitants who had fled to the interior would eventually return and rebuild the city. Tristão da Cunha was wounded in this battle. After that battle, he captured
Socotra.
Capture of Socotra In 1507, a
Portuguese fleet commanded by Tristão da Cunha with
Afonso de Albuquerque landed at the then capital of Suq and captured the port after a stiff battle. Their objective was to set a base in a strategic place on the route to India and to liberate the presumed friendly Christians from Islamic rule. The architect Tomás Fernandes started to build a fortress at Suq, the
Forte de São Miguel de Socotorá. The lack of a proper harbour for wintering led to the loss of many moored Portuguese ships, the most important of which was the
Santo António galleon under the command of captain Manuel Pais da Veiga. The infertility of the land led to famine and sickness in the garrison, and the Portuguese abandoned the island in 1511.
Actions in India After a while, he distinguished himself in India in various actions, such as the
Siege of Cannanore: the Portuguese garrison was on the verge of being overwhelmed, when on 27 August the fleet of 11 ships under Tristão da Cunha coming from
Socotra appeared and relieved them with 300 men.
Raids in Northern Madagascar He launched raids in Northern Madagascar aiming the destruction of Antalaotra and Arabo-Swahili settlements in
Vohemar and Northwest coast. ==Embassy to Pope Leo X==