First siege of Diu
Part of theOttoman–Portuguese conflicts andGujarati–Portuguese conflicts
Date 16 February 1531[1] Location Diu,Gujarat Sultanate Result Ottoman–Gujarati victory
Belligerents
Ottoman Empire Gujarat Sultanate	Portuguese Empire
Commanders and leaders
Khoja Zufar Mustafa Bayram	Nuno da Cunha
Strength
10,000[2]–12,000 men[3] 2 galleons[4] 70 oarships of various sizes[4] severalbasilisks[5]	About 400[6][7][8] vessels: 14 galleons[9] 6naus[9] 2 war caravels[9] 5 large supply junks[9] 2galleasses[9] 12 galleys[9] 16 half-galleys[9] 228 light-galleys[9] 115 small craft and merchantships[9] 30,000 men,[10] including: 3,560 Portuguese soldiers[11] 2,000 Malabarese auxiliaries[11][12] 8,000 combat slaves[11][7] 3,000 slave gunners[11] 1,450 Portuguese sailors[11][12] 4,000 Malabarese sailors or rowers[11] 800 junk ship crew[11]
Casualties and losses
800	31 dead[13] 120 wounded

Thesiege of Diu occurred when a combinedOttoman-Gujarati force defeated aPortuguese attempt to capture the city ofDiu in 1531. The victory was partly the result of Ottoman firepower over the Portuguese besiegers deployed byMustafa Bayram, anOttoman expert.^[14]

Shortly before the siege the Portuguese encountered roughly 800 enemy soldiers at Siyâl Bet island^[a], engaged them in combat, and killed them all.^[15] There were 9^[16] or 17 Portuguese killed and 120 wounded.^[17] They then sailed for Diu, but the Muslim alliance defeated them and killed 14.^[18]

Although Diu was successfully defended, victory was short-lived: Diu was blockaded and the Portuguese armada was diverted towards more exposed Gujarati cities.^[19]Ghogha,Surat,Mangrol, Somnath, Bassein, Tarapur, Kelva, Mahim, Bulsar, Agashi, Patam, Pate, and many smaller settlements were assaulted and sacked, some never recovering from the attacks.^[20][21][12]

In 1534,Sultan Bahadur of Gujarat signeda peace treaty with Governor Nuno da Cunha, granting the Portuguese the territory ofBassein, including Bombay. In 1535, the Portuguese were allowed to construct a fortress at Diu.

• Siege of Diu (1538)
• Siege of Diu (1546)

• ^[a] Gujarati name for jackal island, one of three islands near Diu,João de Barros calls it Ilha de Bet.

20°43′N70°59′E / 20.71°N 70.98°E /20.71; 70.98

• Military history of India
• Diu, India
• 16th-century sieges
• Sieges involving Portugal
• Sieges involving the Ottoman Empire
• Conflicts in 1531
• 1531 in India
• 1531 in the Ottoman Empire

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