1949 Russians celebrate Army Day in Berlin

The video covers a peaceful mission in the British sector of Berlin, celebrating Soviet Armed Forces Day, now known as Red Army Day. A unit visits the Russian unknown soldier's tomb, located 150 yards inside the British zone, where Russian troops and civilian women place memorial wreaths on the monument.

What does the peaceful mission in the British sector of Berlin commemorate?

Describe the location of the Russian unknown soldiers Tomb in relation to the British zone.