What does 2 Chronicles 18:14 mean?

When he got to the king, the king asked him, 'Micaiah, should we go to war against Ramoth-gilead, or not?' Micaiah answered, 'Go ahead and win. They’ll be handed over to you.' 2 Chronicles 18:14 - Modern Text Bible

(Micaiah’s first answer sounds sarcastic, echoing the other prophets, possibly to make a point.)