That is my opinion , occupying Britain and Ireland was not necessary as Britain had been pushed from the continent . The material losses Britain suffered in the Battle for France made any British attempt at intervening on the continent militarily impossible As Anthony Eden the British Foreign Secretary said in an interview on the BBC documentary series World At War , in relation to the state of British armaments “ The cupboard was bare ” . No doubt agreed , the Germans even designed and constructed concrete amphibious barges for the Operation . Complete plans were drawn up for the landing of Airborne troops and Amphibious landings . The real Battle for Britain was on the Atlantic Ocean , that is where Germany kept Britain in check . As for the Air campaign Adolf Galland said in an interview also seen in the BBC “World At War ” series , that after the Air battles in Aug and Sept of the Battle Of Britain had finished in Sept 1940 he staed very clearly that “ I was given my orders for the Russian campaign , I knew then that this war with Britain was a mask for the invasion of Russia ” . I believe these German preparations were really an intelligence ruse to convince the Russians that Germany’s intentions were fixiated on an invasion of the British Isles . Precisely and that is the whole point of my thread , that the German principal was an invasion of Russia simply to colonize Russia as an economic asset . No peace proposals were offered by Hitler , peace was mentioned by Hitler , but no offer of peace , not even a truce , neither offer of talks . If the Germans had of invaded on the heels of Dunkirque there was not much in the way Britain could of done to prevent an invasion . Even after 1941 when the Germans could no longer invade due to a British recovery , Britain still could not intervene on the continent . Even 1942 with the Dieppe raid was proof to the Americans that such a landing on the continent would be some 2 years away . What does you book say the reason for the Germans not carrying through with Operation Sealion ?