Hitler hoped it might result in "eight million going mad" (referring to the population of London in 1940), which would "cause a catastrophe" for the British. In those circumstances, Hitler said, "even a small invasion might go a long way". Hitler was against cancelling the invasion as "the cancellation would reach the ears of the enemy and strengthen his resolve". On 19 September, Hitler ordered a reduction in work on Sealion. He doubted if strategic bombing could achieve its aims, but ending the air war would be an open admission of defeat. He had to maintain the appearance of concentration on defeating Britain, to conceal from Joseph Stalin his covert aim to invade the Soviet Union.