Know Thy Enemy

A knight and his men returned to their castle after a long hard day of
fighting.

"How are we faring?" asked the king.

"Sire," replied the knight, "I have been robbing and pillaging on your
behalf all day, ransacking the towns of your enemies in the west."

"What?!" shrieked the king. "I don't have any enemies to the west!"

"Oh, no..." said the knight. "Well, you do now."