安城 / Ancheng
安城 / Ancheng appears in 《资治通鉴·周纪》73丨历史上自由恋爱的开创者是谁？ as a 魏国 city captured by 秦国 after the anti-Qi coalition victory. The episode says Qin then advanced toward 大梁 before withdrawing.
The source uses Ancheng as evidence that Qin’s post-coalition behavior remains territorial and balancing rather than satisfied by the wealth sent home after 乐毅’s anti-Qi campaign. Ancheng therefore belongs to 秦国东进压力 and the episode’s 联军战后利益失衡 frame.