We all know that Britain was last successfully invaded in 1066, when William the Conqueror defeated the Saxon King Harold at Hastings, but, that does not mean the shores of Albion have not since been attacked.
In 1797 the French landed a small force near Fishguard, in Wales, and were ignominiously forced to surrender. In 1914 a German naval squadron sailed long the north-east coast and bombarded the towns of Scarborough, Whitby and Hartlepool, though no landing was attempted it caused widespread consination.
A more successful attack was made in 1667 by the Dutch, they sailed up the river Medway, which flows into the Thames estuary, attacking British ships whilst they were in dock. It proved to be a crushing defeat for the Royal Navy.