[2] Jacques Coetelij of the VOC, who visited Aceh, reported that on July 1, 1620, the Acehnese launched their armada against the sultan of Perak, almost all of Iskandar Muda's Galleys,[3] The Acehnese army defeated and captured Sultan Mukaddam Shah, alongside his queen, his younger brother named Raja Yusuf, Princess Limau Purut and her Grandmother named Esah Gerbang and some of his entourage, relatives, and companions were then taken to Aceh,[2] The Acehnese captured 5000 prisoners.

[6] The presence of 4 large warships in Malacca demonstrated that the Portuguese were ready to defend their interests in the region against Aceh, Iskander Muda asked the Dutch for assistance against those ships in return for extension of the Contract in Tiku.

[7] Having gotten information of Aceh activity in Perak, the captain of Malacca dispatched 9 oar vessels under the command of Fernão da Costa to the vicinity of Perak, so as to scout the Acehnese armada and escort a number of Portuguese merchant ships that were expected to arrive.

[6] The attack on Perak had worried the Portuguese, according to a Dutch merchant, Adriaen van der Dussen reported on 27 December that Malacca was busy fortifying its base, The Portuguese asked the Johorese sultan Abdullah Ma’ayat Shah to sell them 10 pieces of artillery but Abdullah told them that his artillery was not for sale, even if they paid in gold.

After the disastrous Battle of Duyon River, in which the Portuguese completely wiped out a large Acehnese armada, Perak defected to the side of Portugal.