Securing your position...

[WallShadow]

Originally Posted by StainlessSteelCynic

All of the information presented here is very good. However, how do you translate all of that to a built-up city environment such as New York City, where Kalos has his game set? The principles are the same but the execution is different in a city.
Not a lot of land immediately available for agriculture, lots of highrise buildings for observation of you by the enemy, those same highrise buildings obstructing your line of sight, lots of underground areas available for people to hide in or sneak up on you, lots of buildings/roads/tunnels channelling you as much as they do the enemy, a lot of material for making fires (for either setting you on fire or creating smokescreens etc. etc.), a lot of material for making walls or obstacles and if the enemy really wants to conserve ammunition, they can just drop rocks on you from on high.

From your take on the matter, it would seem that clearing out the "Bad Neighbors" in the nearby/overlooking buildings is a priority. Once done, however, the use of ziplines or removeable bridges/walkways would provide non-combat mobility between the buildings making up your complex.

Signalling (mirror/flash/flag/handsign) from deep inside a room to a room in a directly-adjacent building is nearly uninterceptible.

Dropping rocks on uninvited guests is a possibility as mentioned, but if the inhabitants melt down enough salvaged tire balance weights, they could remold the lead into dart-like shapes that could be tossed out by the handful off the top of the building, letting gravity be your ally.

Rooftop gardens/greenhouses can be constructed, and rooms with a southern exposure will also be prime sites for urban agricultural efforts. Composting vegetable wastes with waste paper (you know, all those tax records, credit card bills, and other now useless documents) will extend the soil and improve the crop yields. Rain water can be collected with canvas funnels suspended over the edge of the roof: irrigation and drinking water with a gravity feed. And the Canyon Effect of tall buildings upon the prevailing wind could be used to generate electricity to provide light to the green houses/growing rooms in off-season. And can you imagine the market's asking price of fresh herbs in the middle of winter? (mmm....rat sauteed with basil and garlic.)

My favorite idea about harvesting an urban resource is very quietly lowering or extending large nets across a building's broken windows, then making a loud noise, allowing the huge flocks of pigeons formerly inhabiting the building to fly right into your larder. If you save a few female pigeons from being dinner, you can set up an egg-production operation. If you can also figure our a way to stampede rats in a desired direction toward your snares/traps, you'll have an embarrassment of culinary riches!

Next thing you know, you'll be planning hunting trips into the sewers to catch those titanic alligators--that's some good eatin'!