After WWII, it took 6 years of guerilla tactics on the U.S. part to get the city of Berlin clean and ready enough to finally be able to pull out. The Brits helped, too, so that I don't have anyone complain from across the Atlantic Pond. Tactics were used, such as:
Toss a grenade into a window, kill a few of the Nazi's still left inside.
Shoot randomly down a street where there are some Nazis.
Interrogate Nazis that were captured to see just where their higher-ups are.
Mind you, this went on for 6 years. Shooting, killing, and overall purging Berlin from Nazi control. The rest of Germany had to undergo the same effects. For 6 years, Germany was under U.S. control as a dictatorship. The Russians had their stake in Germany, sure, but they were already a dictatorship.