Siege of Aru

Siege of Aru (1540)
DateApril–May 1540
Location
Aru (present-day part of Indonesia)
Result Johorean victory
Territorial
changes
Aru becomes vassal of Johor Sultanate
Belligerents
Johor Sultanate Sultanate of Aceh
 Ottoman Empire
Commanders and leaders
Hang Nadim Alauddin al-Kahar
Hereddin Mohamet 
Strength
12,000 men
160 warships
17,000 men
Casualties and losses
Unknown 3,200 killed
15 Ottoman governors killed

The siege of Aru was a military campaign carried out by the Johor Sultanate in April and May 1540, aimed at retaking the Aru Kingdom from the Aceh Sultanate. The campaign involved a coalition of Johor forces, Aru rebels, and Portuguese troops from Malacca. The siege formed part of the larger Johor–Aceh conflict and culminated in the temporary restoration of Aru under Johor's influence.