司马欣 / Sima Xin

司马欣 / Sima Xin enters the wiki through Qinji 129-3 as one of the Qin figures 胡亥 / 秦二世 sends to assist 章邯 in suppressing the anti-Qin rebels. The episode names him together with 董义.

The source does not yet give Sima Xin independent decisions. His page therefore records him as part of the Qin recovery apparatus around Zhang Han: while 张楚政权 is losing commanders and cohesion, Qin still has officials who can be added to the field effort.

Qinji 137 gives Sima Xin a decisive independent role. After 胡亥 / 秦二世 rebukes 章邯 for the post-巨鹿之战 defeats, Zhang Han sends Sima Xin back to 咸阳 to report and ask for instructions. Sima Xin waits at 赵高’s gate for three days without audience, learns that Zhao Gao is preparing something dangerous, avoids Zhao Gao’s pursuers, and returns to warn Zhang Han that the court has become unusable.

His advice reframes Zhang Han’s military problem as a political survival trap. If Qin wins, Zhao Gao may envy and eliminate the successful commander; if Qin loses, defeat itself is punishable. Sima Xin therefore becomes the messenger who converts failed court access into the logic for surrender.

Hanji 139 adds Sima Xin’s post-surrender command role. After 项羽 removes 章邯 from direct control of the surrendered Qin army, Sima Xin is placed over those troops during the westward march. When the surrendered soldiers are killed at 新安坑降, the episode says Sima Xin is spared together with Zhang Han and 董翳.

Hanji 143 makes Sima Xin one of the three Qin kings. Xiang Yu appoints him Sai king, with territory east of Xianyang toward the Yellow River, because of his earlier connection to 项梁. In the settlement, Sima Xin is no longer only a messenger and spared senior surrendered leader; he becomes part of the 三秦压制 barrier against 刘邦.

Hanji 147 shifts that same title from barrier to vulnerability. In 汉中对, 韩信 treats Sima Xin’s Sai kingship as politically thin because Qin people remember the losses of Qin soldiers and the 新安坑降 split between dead common troops and spared senior leaders. Sima Xin’s role in the Three Qin therefore helps explain why Liu Bang might take the region through legitimacy and proclamation, not only battlefield pressure.

Hanji 148-1 gives Sima Xin’s Sai kingship its collapse point. After 章邯 loses at 陈仓 and Haozhi and is forced back toward Feiqiu, Sima Xin recognizes that the Three Qin position can no longer hold and surrenders to 刘邦.

Hanji 152 part 2 shows that surrender as unstable after the 彭城之战. Once Liu Bang is badly defeated, Sima Xin and 董翳 flee or break away again and return to 项羽. In this source, Sima Xin becomes a clean case of 实力重估式阵营转向: the weak Three Qin king first submits when Han Xin breaks the western position, then shifts back when Pengcheng makes Liu Bang look unsafe.

In Hanji 163, Sima Xin dies with 曹咎 after the Chu sortie from 成皋 is struck while crossing 汜水. The episode makes his end part of the same breakdown in disciplined command: Xiang Yu’s order to avoid battle fails, the crossing becomes a trap, and Han recovers Chenggao and 敖仓.

Hanji 165-1 adds Sima Xin’s posthumous political use. After recovering from the 广武 arrow wound and returning to 栎阳, 刘邦 hangs Sima Xin’s head in the market for four days to warn Qin people against renewed two-sided calculation. The source frames this as unusually direct symbolic punishment: Liu Bang does not often display a lord’s head this way in the Chu-Han struggle.

Connections

• Hanji 165-1, 刘邦, 栎阳, and 实力重估式阵营转向 - posthumous head display as warning against renewed switching.
• 胡亥 / 秦二世 - ruler who sends him to support the campaign.
• 章邯 and 董义 - Qin counteroffensive figures named in the same passage.
• 陈胜 and 张楚政权 - rebel target of the campaign.
• 秦国 and 都城防卫动员 - broader Qin capacity context from the preceding Qinji branch.
• Qinji 137, 赵高, 咸阳, and 危机信息封锁 - failed court mission, escaped pursuit, and warning that Zhang Han has no safe loyal option.
• Hanji 139, 项羽, 章邯, 董翳, and 新安坑降 - post-surrender command and survival of the senior leaders.
• Hanji 147, 汉中对, 刘邦, and 约法三章 - Sai kingship as a weak point in Han Xin’s Three Qin diagnosis.
• Hanji 148-1, 三秦压制, 陈仓, and 董翳 - surrender after Zhang Han’s defeats break the containment layer.
• Hanji 152 part 2, 彭城之战, and 实力重估式阵营转向 - return toward Xiang Yu after Liu Bang’s defeat.