Hitler’s invasion plans for Britain WWII – Operation ‘Sealion’ the invasion of Britain 1940 official Nazi folder containing a good group forming part of the plan to invade Britain in 1940 under the codename ‘Operation Sealion’. This group contains seven folding maps covering such things as the road network, electricity supply, geological features etc, together with four booklets including a book of the views of various places throughout the UK, the gazetteer of English towns and cities, a key list of places in the UK, and a collation of town plans. All in good order, though card folder is a little dusty (as usual).