On September 9, they resolved to gather all their forces, consisting of 9 ships and the yacht Arent which was near Ciau, along with the yacht Pau. They hoped to find the ships Leeu and Maen at Crau or Sangy before heading to the Caldera strait. On September 10, command was transferred to Lieutenant Captain Vyanen during their absence. They informed the King and council of Tarnata of their plans.
On September 11, they set sail with seven Malay vessels. On September 13, they noticed the current had pushed them lower. On September 14, they saw Siau but couldn't sail above the island. They decided to send boats from Seelant and Middelburg to Efort to gather any yachts there. They agreed to meet on the west side of Sangy.
On September 15, they reached their fort on the west side of the island. They found the yacht Arent there, the ships Leeu and Maen in Sangen, while the yacht Pau had sailed away without proper orders after Captain Mathys had died. Sir Possingern had appointed a local leader called Ritchil Caluwan (known to the Spanish as Don Duarte) as king, since the previous king had been taken to Manilhas. They left 30 European soldiers there under the command of a major sergeant from Captain Mathys's company.


National Archives / Archives South Holland, archive number 1.04.02, Inventaris van het archief van de Verenigde Oost-Indische Compagnie (VOC), 1602-1795 (1811), inventory number 1060, Heren Zeventien en kamer Amsterdam, INGEKOMEN STUKKEN UIT INDIË, Kopie-resoluties van gouverneur-generaal en raden, Kopie-resoluties van gouverneur-generaal en raden in de serie overgekomen brieven en papieren uit Indië aan de Heren XVII en de kamer Amsterdam, 1610-1637, 1613 nov. 30 - 1615 dec. 24
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