The Erbensong trench ruins in Tai'an Township of Miaoli County is located on the river terrace platform on the southern slope of the Erbensong Police Post, about 1,350 meters above sea level. It was designed to facilitate the Wantian Battery in combat and to prevent from indigenes attacks. There is a piled stone road built next to the Erbensong trench, which is the road that connected Wantian Battery to Erbensong Police Post during the Japanese occupation. The road was mainly used for transporting grains and firearm supplies, so that the Government-General in Taiwan could monitor the northern Atayal group through the firepower of the battery.
Today, the remains of the trench are about 550 meters long, and the Sheipa National Park has renovated it into a hiking trail, surrounded by artificial forests.
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