Did Hitler try to invade Britain ... or didn't he? | Second world war | The Guardian
Operation Sealion: Why Was Hitler's Planned Invasion Of Britain Cancelled? | HistoryExtra
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British troops prepare in Britain for a possible German invasion of England as part of Operation Sea Lion: A squad of Royal Marines soldiers marches through a camp on the west coast
8 Facts About Battle Of Britain You Should Know | Imperial War Museums
Imperial German plans for the invasion of the United Kingdom - Wikipedia