Your deployment zone is in the middle of the map. You will be attacked by a variety of greenskins from all sides.
Deploy your Crossbows in a way that they have a good line of sight across the river in the south so that they can destroy the two upcoming archers. Don't forget the Shield of Ptolos.
Your ogres should be in the west, so that they immediately attack the Archers. Do the same with the Flagellants. The regiments in the north should be the Bright Wizard and Bernhardt. The mortar can be used as a support unit. If he has nothing todo it can be used to destroy the archers across the river.
After the first attack wave various units are attacking from all sides once again. The South can be emptied by using cannon, Ogres and the Flagellates. In the north are magicians and Bernhardt recommended.
After this this unfortenatly easy mission is over.