Meanwhile, Zhang put Hedong's capital Taiyuan under siege. Taiyuan was running low on food supplies, but its defenses held. In late fall, Emperor Taizong himself commanded 50,000 cavalry soldiers (but claimed publicly that it was 300,000) and headed for Taiyuan. When he arrived at Taiyuan's outskirts, Shi urged caution and not immediate engagement, but Emperor Taizong did not listen. Rather, he engaged Zhang's army immediately, crushing it and lifting the siege on Taiyuan. The remnants of Zhang's army took up position at Jin'an Base (晉安寨), near Taiyuan, but the combined Khitan/Hedong forces then put it under siege. While continuing to siege the Later Tang forces at Jin'an, Emperor Taizong created Shi emperor, having his state known as Jin (referred to by later historians as Later Jin. As part of Shi's enthronement announcement, he announced the agreement to cede Lulong and parts of Hedong, for a total of 16 prefectures, to Khitan, as well as to submit a large amount of silk each year as tribute.