Urban warfare is not just "Close Quarters Battle" and "Enter and Clear a Room" that many people seem to think. That 14.5 inch M4gery with a red dot on top? Fine for that sort of thing, but if you wanted a 300 meter gun why not just get an AK?
Urban terrain has very long fields of fire along roads, from rooftops to street level, from storm drains to hill tops. Would you put a machine gun on a rooftop or on street level? If you said "rooftop" I'm not saying that you are wrong, only that you have now limited yourself to plunging fire. There may in fact be very good reasons for putting a machine gun on a roof top, but there are equally good reasons for street level.
As our Jewish Resistance Fighters in alternative 1960 Germany are finding out, terrain is your best asset when you can't win in a stand up fight.
Joseph, the leader of our resistance band has found some military manuals listing the characteristics of the offense and the defense. The German Army has for centuries tried to break down warfare into an exact science. But Joseph has some insight of his own, and realizes something very important. The purpose behind military lists isn't to get you to follow the list, it is to get you to THINK about the effects you want to achieve with the assets you have available. If you have a few rifles and a fair sized town it is different than a backpack full of RPG's and a road running through a canyon. Joseph begins to take stock of his assets, and of the complex urban terrain that has hid his little band for the last month.
Urban terrain has sewers, tunnels, basements, and sometimes even buildings tall enough to BASE jump off of (as seen in any good heist movie).
Next time you are in a city, stop, look around. How far can you see in any given direction? Can you use those lines of sight to set up a snipers firing solution to those distances? The longest shots in Iraq were not taken in the desert, they were taken in cities. Cities are challenging terrain for an occupying force, and they are a rats nest haven for an insurgent. Joseph can walk freely in the city most days, he doesn't look "Jewish" and is known as a hard working handyman. It is common to see him with his toolbox fixing pipes or replacing an electrical outlet.
Joseph uses his mind like a weapon, analyzing everything around him. How long does it take to get from Avenue A to Intersection Z? Where are the police stations, and how often do they patrol?
Joseph is using the "human terrain" to blend in and mask his reconnaissance efforts. And Joseph is planning to use the physical terrain to his advantage in setting up a long range ambush in an area of the city that isn't his safe house. By making the Nazi's crack down on a neighborhood that contains no hidden Jews he thinks he can win sympathy for his cause.
Use the terrain, it is like the force, it surrounds us. If you can't shoot 600 meters you need to learn how, and you need to start thinking in terms of angles of intersections, how to coordinate multiple teams from multiple angles. Imagine four teams stationed 500 meters from the center of a major intersection. With accurate fire, how much terrain do they now dominate? A simple land line phone system and a conference call could let them act as scouts for each other.
And what would the Nazi response be to such an act, a squad of Stormtroopers laying dead in a pool of their own blood? Would they crack down on that area? Would they increase restrictions on civil liberties? Would they alienate the populace?