The bunker ruins in Yanping Township, Taitung County, is a circular fortress with a diameter of 4 meters. It is located next to the Kaili Police Post and was used as a defense against the enemy. Today, only the foundation remains.
The Kaili Police Post was built by the Governor-General in Taiwan to improve the efficiency of monitoring Bunun people in the Pasnanavan area in 1924. The number of police officers stationed increased as police posts at Onzen, Siusui (Qingshui), Songshan, Kaili, Kakaiyu, Tavilin were successively set up on the left bank of the Beisilan River. The Songshan Police Post was withdrawn in 1930, and the control area of Siusui (Qingshui) Police Post was adjusted to cover the area between Onzen Police Post and Kaili Police Post.
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