variety of locally produced goods were presented to Li Bian. Another mission from the Korean Peninsula arrived at Jinling in 938. The group was likely private traders from the recently conquered Silla. A later mission from Goryeo brought more goods as tribute in 940. Decline By the close of Li Jing's reign the Southern Tang was well on the way to obscurity. He had pursued a number of foreign adventures managed by incompetent military officers that generally ended in costly disaster. From 955 to 988 the Later Zhou successfully campaigned against the Southern Tang. Li Jing was forced to cede all prefectures north of the Yangtze River and become a Later Zhou tributary. The realm became territorially truncated and lost the economic and political relevance it enjoyed when Li Jing assumed the throne 15 years earlier. In February 960 Zhao Kuangyin deposed Guo Zongxun and established the Song dynasty as Emperor Taizu. Li Jing quickly sent envoys to confirm his loyalty and vassalage to Taizu. Taizu pursued an expansionist agenda to unite China under his rule. Jiangnan was not a tactical priority compared to other states and was left alone in return for considerable tribute. In August 961 Li Jing died and his son Li Yu took over. Li Yu kept a semi-independent status but came at a steep price of consistent tribute of gold, silver, and silk. Jiangnan was significantly smaller than the Southern Tang territorial apex achieved in the 950s. This made the large quotas demanded by the Song challenging to meet. In 964 the Song decreed new economic regulations that made the situation even more dire. Northern merchants were forbidden travel into Jiangnan. New commodity taxes were imposed in Jiangnan that could only be paid in gold or silver. The Later Shu were crushed in 965 by Taizu. In 971 the Southern Han were likewise conquered by the Song. Taizu now turned his attention to Jiangnan. Throughout 973 and 974 Li Yu was repeatedly summoned to the Song court. He feigned illness and claimed to be unable to make the trip. Tired of these excuses, Taizu raised an invasion force under the command of Cao Bin to extinguish Jiangnan. The campaign began in November 974 and proceeded favorably for the Song. The Yangtze River was overcome with a floating bridge built across from Caishiji. Song forces crossed the waterway and secured a bridgehead. Outside Caishiji an army