Your answer is:
" Hitler was therefore surprised when Britain did not surrender. On 16 July, he issued 'Directive Number 16'. This authorised detailed preparations for an invasion landing in Britain, codenamed Operation Sealion. It stated: "The aim of this operation is to eliminate the English motherland as a base from which war against Germany can be continued, and, if this should become unavoidable, to occupy it to the full extent".
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