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'.
Input: Context: Hope served as aide-de-camp to Sir William Erskine in the Flanders Campaign. Link Information: After the declaration of war with revolutionary France he served on the staff of the Duke of York in the Flanders Campaign from late 1793. Question: What was the rank of the man Hope served under in the Flanders Campaign?
Output:
Answer: taff of the Duke of York