The relatively modest Portuguese fleet achieved an absolute victory over the Ottoman-allied Aceh in that not a single ship or man of the invading force sent to conquer Malacca returned to their country.

[9] Despite this setback, Iskandar Muda proceeded with preparations for the attack on Malacca, yet this raised some doubts among his command: the admiral of the fleet, identified by the Portuguese as the Laksamana, opposed the campaign.

[13] The Acehnese fleet appeared before Malacca in the first days of June 1629, numbering 236 vessels, 38 of which were very large galleys with three masts bearing top-sails, and armed with heavy bombards capable of firing 20 kg shots, roughly equivalent to galleasses.

[17] Fearful that his ships might be caught off-guard by a Portuguese fleet if he left it anchored out on the open sea, the Laksamana decided harbour them within the Duyon River one league to southeast of Malacca.

[23] All remaining Acehnese vessels withdrew into the Duyon River to avoid capture, and thus the naval line of communication and supply into Malacca was fully secured, ruling out the possibility of starving the Portuguese out.

[24] In spite of the superiority of his fleet relative to that of Johor, the Laksamana chose to ignore it and remain on land to prepare a final assault on the city.

[25] Portuguese India was governed by the aging Bishop of Cochin Luís de Brito who replaced Viceroy Francisco da Gama, who had been dismissed under the accusation of irregularities.

[26] The Bishop ordered Miguel Pereira Borralho, then patrolling the Coromandel Coast with a force of light galleys to proceed to Malacca, before dying on June 29.

Dom Nuno also participated with his own money, and went bankrupt in the process; nevertheless, in order to help two officers who had lost their horses, he offered them his own, and proceeded with the arrangements on foot, which garnered him widespread esteem among his soldiers.

[29] The fleet departed from Goa in high spirits on September 8, 1629 to the Malay Peninsula numbering 1 brigantine, 5 half-galleys and 23 light galleys, bearing 900 Portuguese soldiers.

[30] On September 30, Borralho reached Malacca with 100 soldiers, which caused great joy to both the defenders as well as the Acehnese, who believed that was all the relief the Portuguese could hope for.

[39] With the coming of the spring tide on November 8, the Acehnese attempted a final, push out of the river, led by their flagship, a very large galley named Wonder of the World.

[49][50] The Battle of Duyon River proved to be a decisive engagement that ended aggressive Acehnese expansionism and started a period of internal dispute and decline in Aceh.