Which army did your grandfather serve in? Unless he served in the Soviet (or possibly in the German) army, there's a problem. Berlin fell to the Soviet Army in April 1945, but American and British soldiers didn't enter Berlin till July 1945. The notion that a German flag would have been left flying for that length of time, especially in central Berlin, is not credible. It would be helpful to know which army the questioner's granfather served in.
Hitlers body was cremeted in a pit outside of what is now apartments in berlin, ontop of the Berlin bunker.
It would be Berlin, Germany in approximately April 1945.
Hitlers Berlin Olympics
The location of Hitler's remains is unknown to prevent it from becoming a fascist memorial.
Bonito Mussolini
Suicide in his Command Bunker in Berlin. He did this to avoid capture by the Soviet Army that was in the process of seizing Berlin.
Nothing significant happened in Berlin on D-Day except panic among the High Command of the German forces. - Berlin is over 500 miles from Normandy.
In a military command bunker in Berlin, Germany
The Battle of Berlin, when the Russians (Soviets) entered the city.
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As soon as the Red Army entered Berlin and declared war on Japan in 1945.
Yes, soviet troops entered Berlin in May 1945