Q: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Context: Liu Bei combined forces with Cao Cao and defeated Lu Bu at the Link Information: The Battle of Xiapi was fought between the forces of Lu Bu against the allied armies of Cao Cao and Liu Bei from the winter of 198 to 7 February 199 Question: How long did the fight last in which Liu Bei and Cao Cao defeated Lu Bu?
A:
Answer: from the winter of 198 to 7 February 199