The Dutch suffer frequent attacks by the local indigenous on both the Dutch established village of Sakam, where mainly Dutch and Chinese merchants conduct their trade, and on their allies in Sinkan village. Hans Putmans, like his predecessor Pieter Nuyts, kept asking for Batavia to send military reinforcements. In 1635 they finally consented and Putmans was ready to put the hammer down.
Link to the Taiwan government website for the Siraya people.
Link to the Wikipedia article on the Siraya people.