Detailed Instructions: In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
Q: Context: He was present at the Battle of Manzikert in 1071, where he refused to join the fray Link Information: The Battle of Manzikert was fought between the Byzantine Empire and the Seljuk Empire on 26 August 1071 Answer: 1
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
How long did the battle where Roussel de Bailleul refused to fight last?