Mythology: Norse: Collective name for the Gods and Goddesses of Scandinavia.?

Questions

What was Operation Sealion?

Shostakovichs seventh symphony is named after which besieged Soviet city?

Who did Count Claus von Stauffenberg attempt to assasinate with a bomb on 20 july 1944?

Who replaced Churchill at the Potsdam conference in July and august 1945?

Where did the British surrender to the Japanese in Feb 1942?