You will be given a definition of a task first, then some input of the task.
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: Fort Mercer was a fort on the Delaware River in New Jersey constructed by the Continental Army during the Link Information:

The Battle of Princeton was a battle of the American Revolutionary War, fought near Princeton, New Jersey on January 3, 1777 Question: How long after the Battle of Princeton did the war during which Fort Mercer was built end?
Output:
Answer: 6