Xunfang Fortress 巽方砲台 is another obscure historic site in Tainan that I found while digging into the archives of the excellent Tainan City Guide. This Qing dynasty era ruin can be found on the grounds of a monastery in East Tainan not far from the location of Dadong Night Market 大東夜市.
Much of Taiwan was ruled by the Qing Dynasty (清治時期) from 1683 until 1895 when Japan acquired Taiwan and Penghu in the aftermath of the First Sino-Japanese War. At this point the Japanese colonial era begins.