The Northern Han is a small kingdom located in Shanxi, which ad been a traditional base of power since the fading days of the Tang Dynasty in the late ninth century and early tenth century.

With its capital located at Taiyuan, Northern Han is wedged between the two major powers of the day, the Liao Dynasty to the north and the Song Dynasty to the south.

It also shares a border with the Tangut kingdom of Western Xia.

The existence of the Northern Han is one of the two major thorns in relations between the Liao Dynasty and the Song Dynasty, the other being the continued possession of the Sixteen Prefectures by the Liao Dynasty, under whom the Northern Han has placed itself in protection.

Emboldened by his success to the south, Emperor Taizong has decided to embark on a campaign to finally destroy the Northern Han.

Leading the army personally, he brings his forces to the Northern Han capital of Taiyuan, which is laid under siege in June.

An initial relief force sent by the Liao is easily defeated by the Song.

After a two-month siege of the capital, the leader of the Northern Han surrenders, and the kingdom is incorporated into the Song Dynasty.