Yanmen Gate is a border setting through which the novel examines the human cost of conflict among the Song, Liao, and Jurchen peoples. For Xiao Feng, the frontier is not an abstract line separating enemies: after learning that he is Khitan, he sees how quickly political allegiance and inherited identity can divide people who share ordinary human needs, and he acts to protect captives on both sides.

A frontier of exchange and conflict

Yanmen Gate stands in Xiao Feng’s thoughts as a place where the violence of border warfare becomes personal. He recalls seeing soldiers from Great Song capture Khitan civilians there; later, he encounters the reverse, when Liao soldiers bring Song civilians to him as captives. The changed direction of the raid does not alter its human consequences: people are seized and treated as spoils in a recurring cycle of retaliation.

The wider frontier is also a zone of contact. Among the Jurchen, Xiao Feng is received as an honoured guest despite being Khitan, with a Han-speaking salesman serving as interpreter and the Jurchen chief’s son AguDa praising him to the tribe. That welcome contrasts with the sudden hostility of other encounters: when Khitan riders meet Jurchen hunters, they shoot without first establishing who they are. The border brings distinct communities together, but proximity alone does not prevent them from treating one another as enemies.

Raiding as a system

The novel places civilian suffering within the military economy of the Liao. Its troops are not supplied with provisions or paid salaries, so they obtain what they need by raiding neighbouring peoples. The practice called “Beating The Grass Valley” is, in Xiao Feng’s judgment, little different from robbery. Great Song forces retaliate against Liao civilians in turn, naming their raids “Beating The Standing Valley.” The paired terms make reciprocal violence sound like an established custom, while those living near the frontier bear the cost in fear and displacement.

Xiao Feng’s encounter with the captives makes that system concrete. A Liao unit brings roughly seven to eight hundred prisoners, mostly young women, along with goods from its raid near Zhuozhou, close to the Song border. The captain presents the captives and valuables to Xiao Feng as an offering to his rank. Xiao Feng instead asks where the raid took place, then speaks to the prisoners in Chinese and hears one young woman plead to return to her parents. The episode reveals how military authority can turn people into tribute—and gives Xiao Feng a choice about whether to accept that logic.

Political crisis and the weight of kinship

The frontier’s political stakes reach beyond raiding. A rapidly relayed bugle signal interrupts a Liao hunting feast and announces rebellion in the capital. The crisis involves Prince of Chu YeLu NieLuGu and his father, YeLu ZhongYuan, the emperor’s uncle and commander of the army. The account traces their position to an earlier succession dispute: YeLu LongXu had chosen his eldest son, YeLu ZongZhen, as successor, though the empress favoured her younger son ZhongYuan. ZongZhen thwarted her plan with his brother’s help, then elevated ZhongYuan in the succession; later, however, ZongZhen’s son YeLu HongJi inherited the throne. HongJi subsequently gave ZhongYuan exceptional rank and military power, while appointing NieLuGu to command the Southern Chancellery.

In the ensuing campaign, HongJi’s forces face a much larger rebel army. The emperor promises rewards, personally leads his troops, and has them build a defended stockade with about ten thousand archers. The battle’s balance changes when the rebels bring forward captured relatives of the imperial soldiers. HongJi’s policy of keeping soldiers’ families in the capital had been intended both to reward loyalty and to discourage revolt; during the rebellion, that same arrangement gives the enemy leverage. As soldiers leave the stockade to reach their families, the army loses cohesion and HongJi retreats with the remaining force. The episode shows how imperial control and military discipline can be undone by the family ties they were designed to manage.

Xiao Feng’s choice and the frontier’s meaning

Xiao Feng’s loyalties are tested repeatedly at the border. During the clash between Khitan riders and Jurchen hunters, he recognizes the Khitans as his own people, yet refuses to let that affinity justify an unprovoked attack. He disarms and dismounts Khitan riders without killing them, then uses their own bows to wound others in the shoulder or foot rather than take their lives. His intervention does not erase the conflict, but it marks a limit he will not cross on behalf of ethnic solidarity.

His response to the Song captives carries that limit further. Xiao Feng remembers the Khitan civilians seized at Yanmen Gate and recognizes the suffering before him as its counterpart. He questions the habit of dividing people by whether they are Khitan, Song, Jurchen, or Korean, and rejects the insults each side uses for the other. Rather than keeping the captives or treating their release as a reward for loyalty, he orders them to go home and warns them to move away from the border, where another raid might reach them. Yanmen Gate thus becomes a measure of Xiao Feng’s moral position: the frontier exposes how inherited identity can divide him, while his actions insist that civilians on either side remain human beings deserving protection.