There are no special gimmicks on this map; you just need to head forward and defeat all of Garon's soldiers. Like before, don't stretch out your units too far and make sure to calculate their placements based on their defensive and offensive capabilities as well as the nearby enemies' positions.
After clearing the enemy vanguard, you'll have to break through the defensive line made up of high level generals. After breaking through, regroup and move your forces outside the attack range of Garon and his last two units. Pair up your most powerful attackers and take out Garon.