Someone mentioned the Germans invading Britain, so here’s my take on that.
Operation Sealion (invasion of Britain) was canned by Hitler right after Germany’s worst day in the battle of Britain. Britain’s RAF ruined the effectiveness of the Luftwaffe, and so Hitler decided to bomb the cities. Operation Sealion was dropped BEFORE the decisions was made to switch to bombing Britain’s cities. When the heavy bombing of Britain’s cities ensued, Operation Sealion, and hopes of invading Britain by sea, were already squashed. The German’s knew that with the terrible losses to the Luftwaffe, an invasion of Britain would not be impossible, largely because the Royal Navy was still very strong and defeating it without the air superiority that the Luftwaffe once possessed, it would not be possible.
By this time, Germany’s Wolf Packs of submarines were dwindled, and of little use to taking out the Royal Navy. There was nothing the German’s could have done to invade Britain after the terrible losses to the Luftwaffe.I suppose you could say that the RAF prevented a possible invasion of Britain before it could happen.
There is an article on the BBC’s web site that explains this, but I don’t have the link right now.
I recall that the Germans never reconciled the Army/Navy argument about whether to land on a broad front (Army) or a narrow front (Navy) although they did amass some barges (nothing like the Higgins boat) in French waters.