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: McJunkin was approximately 9 years old when the Civil War ended Link Information: The American Civil War (also known by other names) was a civil war fought in the United States from 1861 to 1865 Question: For how many years did the war last at the end of which McJunkin was nine years old?
A:
Answer: 4