“After mid-1940, Britain controlled the sea and air...”
BS. It wasn’t until the summer of ‘42 that the allies even had a strategy to deal with German wolfpacks sinking huge tonnage of materiel. By 1940, the British were all but knocked out of the war.
So far is this from the truth, that between September 1939 and 1943 the British-controlled dry-cargo fleet actually increased, from 18.7 million deadweight tons to 20 million tons.
(Source: Britain's War Machine; Weapons, Resources and Experts in the Second World War, by David Egerton (Allen Lane, 2011) - a mine of useful corrective data for some of the commonly-held myths about the British in WW2)
Utter rubbish.
In the Atlantic, the main time for Germany to win the sea war was late 1940, they failed because of British-Canadian skill and bravery, but also because the Anglo-Canadians came up with constant technology to stifle and defeat every German tactic and German U boat technology. The Canadian use of the Corvette for example was a godsend, little and frankly unsuitable craft on paper they may have been, but by god they worked.
From late 194o onwards, the balance shifted to the Allied forces. Still dangerous and still a war on the sea to lose, but the German chance to win the sea had gone.
In fact, it was the US entry in 1942 that almost lost the allies the battle for the Atlantic, as the arrogant and violently Anglophobic Admiral King refused to change his tactics to parallel the British-Canadian tactics, and the U boats sunk masses of US ships until King was forced to change.
Between June 15th 1940 and December 7th 1941, the British defeated the Germans in the battle of Britain, started slowly to turn the tide in the Atlantic, sunk the Bismarck, started bombing raids of Germany, destroyed the Italians in North Africa, fought the Germans in the same field of battle, defeated Rommel in Operation Crusader (relieving Tobruk), founded the SAS, SBS, the Paras, the Commandos and the SOE, started supplying and training the European resistance to the Nazis, defeated a pro-Nazi uprising in Iraq, invaded and quelled another pro-Nazi uprising in Iran, started and undertook commando and paratroop raids on mainland Europe from Norway to France, defeated the Italians in both Somaliland and Ethiopia, fought in Greece, fought in Crete and invaded and took control of (Vichy French) Syria
And Britain had its own nuclear programme up and running (Tube Alloys), with a site in Canada. Oh and in 1940 we gave you all our nuclear secrets.
British military chiefs even drew up plans for an Anglo-French war with the then pro-Nazi USSR over Middle Eastern oil fields!.
Some ‘defeated’ nation.