The strength of Acheh was brought to an end with a disastrous campaign against Malacca in 1629, when the combined Portuguese and Johor forces managed to destroy the fleet and 19,000 Achehnese troops according to Portuguese account.[3][4] Johor later grew stronger and formed an alliance with the Dutch to attack the Portuguese Malacca and conquered it on January 14, 1641, ending the triangular war. Subsequently in the following month, Iskandar Thani of Acheh died and was succeeded by Queen Taj ul-Alam. Her reign marks the beginning of decline of Acheh position as a regional power.