Master Tactician achievement

Description
Win a battle on Hard difficulty in the camp Training Tent using 6 rank 5 units.

How to get it
You can play game on Easy, gather allies, Renown and items to improve your chances, then in right moment raise difficulty and try to get it. Best time to get this may be before Boersgard when you will have almost every item and two guaranteed Rank 5 units, Eyvind and Sigbjorn. In battle use your turn advantage and cripple units before starting to kill them.