THE REIGN OF HSING-TSUNG 121
centered at Tun-huang, was the state of Sha-chou, ruled by the Chinese
warlord family of
Ts'ao.
This latter seems also to have passed under Uighur
dominance during the early eleventh century. In 1006 the Sha-chou ruler
Ts'ao Shou had sent a tribute mission to Sheng-tsung's court, which seems to
have encouraged Sheng-tsung to attack the neighboring Uighur state in Kan-
chou. Expeditions were sent against Kan-chou in 1008, 1009, and 1010.
Although the Khitan achieved some limited success, sacking Su-chou and
deporting its population in 1010, these campaigns failed to conquer the area,
which was at the same time under attack from the Hsia. Another expedition
in 1027 laid Kan-chou under siege but failed to take the city, and it ended in
disaster when the retreating Khitan army was ambushed in southwest Mongo-
lia by the Tsu-pu tribes, who always strongly resisted Khitan attempts to
expand to the west.
The Hsia, meanwhile, continued with their gradual incorporation of the
area known as Ho-hsi (western Kansu). In 1020 they built a new capital city
at Hsing-chou (modern Yin-ch'uan, later renamed Hsing-ch'ing). By 1036
they occupied the Kan-chou area, and although Sha-chou remained at least
semiautonomous until the 1050s, the Hsia claimed that even Khotan, deep
in the Tarim basin, was its vassal. In 1038 the Hsia king Li Yiian-hao
proclaimed himself emperor of the state of Ta Hsia and sent an embassy to
K'ai-feng repudiating, in a provocative and insolent letter, his vassal relation-
ship with the Sung. The new Hsia emperor had been married to a Khitan
princess in 1031 shortly after Hsing-tsung's accession, but the royal couple
did not agree, and early in 1038, when the princess died, the Khitan court
sent an envoy to inquire into the circumstances of her death.
1
'
6
For some
strange reason the
Liao shih
makes no mention of Yuan-hao's assumption of
the imperial title or the Khitan court's response.
The Sung, meanwhile, took strong action. They first revoked all the titles
that Yuan-hao held from the Sung court, placed a reward on his head, and
suspended the border trade on which the prosperity of the Tanguts heavily
depended. Gradually the relations between the Sung and the new Tangut
state deteriorated, until in 1040 the border clashes escalated into full-scale
war. Fighting dragged on spasmodically until 1044, broken by a series of
negotiations. In spite of all their efforts the Sung armies suffered a succession
of major defeats, the Tanguts proving themselves formidable adversaries.
At the beginning of this confrontation the Liao court did not intervene,
receiving embassies from both sides, each of whom reported their progress in
the war. That the Sung were in serious trouble soon became clear, however,
and after a particularly disastrous Sung defeat in 1042, the Khitan decided to
136 LS, 18, p. 220; 115, p. 1526.
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