岸门 / Anmen (Warring States)
岸门 / Anmen appears in 《资治通鉴·周纪》48丨君王为啥不能传位宰相 as the place where 秦国 defeats 韩国 in 周赧王’s first-year frame. The episode locates it south of present-day Hejin in Shanxi.
The notice matters because Han responds by sending crown prince Han Cang, later 韩襄王, to Qin as a hostage. Anmen is therefore a compact marker of 秦国东进压力: Qin’s battlefield success turns directly into hostage diplomacy and Han’s search for peace.