Detailed Instructions: 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'.
Problem:Context: After the outbreak of the French Revolution he advanced in rank to sergeant major on 12 September 1789 Link Information: beginning in 1789. The Revolution Question: How long did the civil unrest that saw Quesnel promoted to sergeant major last?
Solution:
Answer: 15