西汉第二次定襄出击 / Second Dingxiang Campaign (Western Han)

Overview

西汉第二次定襄出击 / Second Dingxiang Campaign is the campaign setting in which 卫青 divides a Han army into three search routes, wins with the central force against a large 匈奴 formation, and then discovers that neither wing nor the chanyu has appeared. Its current significance is the gap between a local battlefield victory and complete campaign control.

Current Profile

Hanji 296-2 says Wei Qing again leaves Dingxiang with 50,000 troops while the Xiongnu main force avoids easy detection. He sends 赵信 and 苏建 with 3,000 cavalry to the right, assigns the officer rendered as 郝贤 to the left, and advances in the center with 张骞 as guide.

The central force meets a nearly equal-sized Xiongnu formation first. Wei Qing sends light cavalry to order both wings toward the center, then attacks before they arrive. The episode attributes the resulting rout to Han weapon reach, crossbow pressure, formation depth, and forced close contact, but the campaign remains open because the wings never join and the defeated force apparently does not contain the chanyu.

The next-stage consequence appears in Hanji 297 rather than this bounded source: the right wing is destroyed, Zhao Xin surrenders, and Su Jian returns for command review. This page records the operational setup without importing those later details into its canonical source inventory.

Key Characteristics

• Three-route search operation designed to find and compress a mobile opponent’s freedom of movement.
• Central engagement in which Wei Qing commits before the planned left-right convergence occurs.
• Local Han victory explained by the episode through equipment integration, formation depth, and close-contact pressure.
• Incomplete operational picture because both detached wings remain absent during the central battle.
• Campaign hinge whose apparent victory precedes the right wing’s separately documented disaster.

Evidence

Campaign design and first contact:

• Hanji 296-2 describes the 50,000-person departure, three-route division, central contact, and orders for the wings to converge.

Local result and unresolved control:

• Hanji 296-2 reports a rapid Xiongnu rout and almost 10,000 dead while emphasizing that neither wing arrives and the chanyu is absent.

Battlefield explanation:

• Hanji 296-2 attributes the central force’s advantage to combined crossbow, long-weapon, short-weapon, chariot, and formation effects.

Qualifications

This profile rests on one five-minute podcast summary rather than a primary-text campaign reconstruction. The campaign label and sequence, Dingxiang rendering, troop and casualty totals, route geometry, 郝贤’s identity, Zhang Qian’s exact function, order timing, battlefield location, weapon prevalence, tactical causation, chanyu inference, and reasons for the wings’ absence remain episode-attributed. A central rout does not establish annihilation of the opponent’s main force, strategic victory, or consistent Han superiority across terrain and campaign stages.

What Changed

• Created a focused campaign entity separating the central engagement from the later right-wing command-law case.
• Defined the campaign around the mismatch between planned convergence and actual isolated contact.
• Preserved local victory while withholding a claim of complete operational success.

Relationships

• 卫青 - central commander who designs the three-route search and wins the local engagement.
• 匈奴 - mobile opponent whose avoidance strategy complicates identification of the true main force.
• 赵信 - right-wing commander absent from the central engagement and involved in its later consequence.
• 苏建 - right-wing commander whose later return triggers command review.
• 张骞 - guide attached to the central route in the episode.
• 合成兵器体系压制骑兵机动 - tactical explanation offered for the local Han advantage.
• 游牧骑兵劫掠不对称 - strategic contrast showing why avoiding contact can remain valuable despite frontal disadvantage.