Since the majority of humans today live in cities, urban combat will be dangerous, time-consuming, and frustrating. In Beijing, New York City, Los Angeles, and Tokyo alone, you may have upwards of 50 million zombies.Urban combat is more difficult than rural or country combat because in an urban setting, there are buildings almost everywhere, and the ones that have toppled will leave large piles of debris and dust. Many cars will be left in the streets. Also, there may be hundreds of hostile survivors. Large cities also have the highest potential for being hit by nukes or being attacked by the army. The streets will be battle zone, as hellish as World War 2, or Rambo on drugs.

3 possible ways to do urban combat

• First, yell over loudspeakers for any and all survivors to evacuate as soon as possible. Do this every hour for 3 days, while killing zombies that are seen in the street. Use tanks, helicopters, and sheer force to topple buildings. Be aware of the fact this may attract many hundreds of thousands of zombies. After the dust settles, kill anything you see unless it is obviously a friendly or a friendly survivor. This plan wil take from 4 days to 2 weeks, and requires tanks, helicopters, at least 1,000 armed, trained men, and great leadership.

• You could fire a nuke at the city without anything more than a tear. This could kill more survivors than zombies and is hazardous for the surrounding 580 or 100 miles and the Earth itself. This will only make sense if ALL radio contact is lost and no cities nearby have any radio contact. This plan is ruthless, and requires mere minutes to do, but requires a nuclear missle. This will decimate the city and destroy the nearby area. The only possible survivors would be people in the fallout shelters.
• You could send in armed men to retake the city building by building and block by block. This is the most risky plan and WILL cause many deaths. This requires hundreds, if not thousands of armed men and women, the willpower to know you probably won't come out the same you went in, the firepower to supply them all equally, and the guts to be with them.

Contrary to the above: Cities will not remain a serious feeding ground unless all means of departure are finished, E.G. Manhattan Island. If the island is closed off from the remainder of the area, then the majority of our Zed's will stay on the island. If they are mainland locations, E.G. Los Angeles, and Tokyo, the major amounts of undead will depart from the urban environment when their main source of flesh is majorly depleted. In other words: Those undead will follow the sounds of the departing crowds. -Biohazardouswithin

It'd be usefull just to hide in a building with enough food, and water for the duration - Lamnov

Lamnov, there is no telling how long the duration could be. It could be anything from a couple of days to a couple decades. If you want to have enough to last a couple decades and can't make a garden, I recommend a fallout shelter with a built-in fridge.

Best bet would be to just leave cities to their own demise after evacuations have been commenced. Then setup patrols surrounding the city about 15 miles away so even though the city would be lost for the time being those 5million plus zombies won't start moving out for a while at least in mass so any zombies who just happen to get out of the city will be taken out quickly and without the chaos of actually having to fight in an urban setting. sure it's a downer to lose a major city during a war of any kind but even highly trained army personnel would have difficulty clearing out an entire city the size of New York or Tokyo the end result would most likely just end up making more zombies-ReverantFaun

Just for people to understand, a proper building clearing for a 2 story building will take about 25 well-trained military personnel. So you would need several thousand men to clear a suburban area.That's buildings have maybe a dozen suriviors or hostile military in there. Now expand to having to deal with a city with more zombies in there then are in you entire army (most likely by z-day + whatever, maybe 2 or 3 times your size). Then factor in your hostile survivors, fanatics, bombs and traps survivors made to kill zeds, the weather (yes has an effect), your supplies, the amount and size of the buildings, time, risk of infection, possibleother groups of zeds arriving, how clear roads are, fires, debris, body disposal, establishing a pertimiter, ambushes, your weapons, your force's size, morale, the quality of your men's training, and about a hundred other things. Urban warfare in the zombie world would be near impossible. -Tacticalplanner

Sporezombie
Urban Combat is first, the hardest thing to do in a zombie war. Depending on your man power it may be a good idea to avoid it entirely but if you need to fight in a urban enviroment in a long term scenario wait untill winter so the zomibes will be frozen and less of a danger to your forces and go in with shotguns and a medium range semi-auto weapon for each fighter. Also have a secondary firearm with at least 30 shots something small like a pistol would be good. For each building try lureing out the zombies and have a firing squard waiting for them then when no more zomibes come out then go in and check each room. If you have first hand experience in your group about the underground of that city if it has one then go in and clear them out GOOD LUCK! but if you don't then seal them out and wait until any zomibies down there rot away. When it comes to your formations try staying together in groups of 10 specailizing weapons if you can. Have a team for reckage clean up and one for body clean up burn piles are faster than burying people if you want to honor your fallen commrades then leave a tombstone or memorial anyway. The two most imporant things in Urban combat is repetion, check everywhere three times or more and ALL WAYS HAVE A ESCAPE ROUTE.