What do air raids do?

yes

To protect people from bombs.

Hitler decided to bomb London in a desperate attempt to destroy the British peoples morale in hope that Britain would back down from the war. He bombed the major cities like London as they were...

As soon as aircraft (and that includes airships and blimps) were capable of carrying bombs. There were many air raids in WWI.

Air raids are where planes fly over cities or towns and bomb them. There is no raid as such, but the place is bombed. This is why there are places called air raid shelters, either steadily built...