Arromanches-les-Bains or simply Arromanches is a town in Normandy, France, located on the coast in the heart of the area where the Normandy landings took place on D-Day, on June 6, 1944.
Arromanches-les-Bains is where William the Conqueror planned his invasion of England.
From the context, we do not know whether or not Arromanches-les-Bains is where William the Conqueror planned his invasion of England, therefore the statement is neither definitely correct nor definitely incorrect.
( z1 plan :ARG0 ( z2 person :name ( z3 name :op "William" :op "the" :op "Conqueror" ) ) :ARG1 ( z4 invade :ARG0 z2 :ARG1 ( z5 country :name ( z6 name :op "England" ) ) ) :location ( z7 city :name ( z8 name :op "Arromanches-les-Bains" ) ) )