I want to know the answer to the following question:
In what year were Han forces defeated in Baideng?
All the background I'm provided with is that "After negotiations, the heqin agreement in 198 BC nominally held the leaders of the Xiongnu and the Han as equal partners in a royal marriage alliance, but the Han were forced to send large amounts of tribute items such as silk clothes, food, and wine to the Xiongnu.". Is that enough to answer the question?
Answer: no