Pahang formed part of the force of three hundred sail and eight thousand men which assembled in the Johor River for a reprisal attack on Pattani, but later negotiations settled the dispute. In 1550, Pahang sent a fleet to help Johor and Perak in the siege of Melaka but the Portuguese warships so harried the harbours of Pahang that the attackers had to retreat to defend their own capital. Sultan Zainal Abidin died about 1555 and was succeeded by his eldest royal son, Mansur Shah II, who about the time of his accession married his first cousin, Purti Fatimah, a daughter of Sultan Alauddin II of Johor (who died at Aceh in 1564).