Next, you must go back from the armory. When you are in the fork in the road behind the wooden hallway, it is recommended to go straight to the building in the east from your current position. There, you can find the second floodlight (M4,7), the building itself should not be guarded. Only someone from the sentry box in the south can notice you.
When you destroy the floodlight, go down. Now, go and climb at the warehouses on the east side - you can freely move on their roofs. Move to the last warehouse. In the center of the square there is the crane on which (if you haven't already eliminated him) the sniper stands (M4,4) - you must absolutely kill him (and do it quietly).
The anti-aircraft cannon is next to the shore, at the edge of the map (M4,8). From there you can shoot from the Panzerfaust (M4,1). Of course, you can destroy the cannon by using explosive charges but the path to it is dangerous. After an accurate shot (the explosion animation is played) quickly get to the farthest warehouse and wait for soldiers to call off the alarm.