Yet again, this side mission will put you up against the former city police force. This time, you will be hunting mostly aerial units and howitzer batteries. In this mission, the rebelling police have captured a city and arranged gun batteries on the rooftops of three buildings. It is up to you to destroy the gun batteries and wipe out the remaining aerial units. When the mission starts, run forward to bring up a new tutorial message.
This tutorial will tell you about using High Boosts and Boost Charges. Hit Square/X briefly to dash in whichever direction you are holding the left stick. Hold down Square/X to perform a boosting attack, covering distance while dealing some damage to whatever is in your path at the same time. The tutorial will also tell you about repeatedly jumping against the sides of buildings to scale them, but you may have already used this strategy in Order 3 and if so you will be greatly familiar with it. After dismissing the tutorial, head straight ahead towards the tall skyscraper. Scale the building by boosting up the wall. When you reach the top, look to the northwest to find the first aerial unit. Shoot it out of the sky.
Hop across the street to the building to your north. Watch out for the gun batteries, which will start shooting at you around this point. If you have a Sniper Rifle, you can snipe a few aerial units straight ahead from this perch. Otherwise, keep going. Jump and boost over to the tall skyscraper to the northeast, avoiding the gun battery’s fire as you go. From the north edge of this building, you can look down to the rooftop below and blow up the first gun battery. Look down and to the northwest, across the street from the first gun battery, to find the second. Rain rifle shots down on it to eliminate it quickly and efficiently.
After killing the second gun battery, boost jump diagonally to the northwest to land on the other tall skyscraper dominating the skyline. Two aerial units will circle this building if you didn’t snipe them earlier. Shoot them down, and then walk to the north side of the rooftop and look down to find the last gun battery. Destroy it, and then jump to the small brick building in front of you. Scan the skies to find the last two aerial units. Shoot them down to complete the mission.