useless trivia: What Word Means: A Genus Of Air-breathing Snails?

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?