Possible British and German cross-Channel gun duels

Could British coastal fortifications help an invasion across the Channel?

British and German heavy batteries are tentatively recalled as exchanging fire across the Channel, but no specific support for an invasion is identified.

Long-range British and German coastal guns are tentatively recalled exchanging fire across the English Channel during World War II. Their range could extend the fighting beyond each side's shoreline. No battery or engagement is identified, so direct support for a particular invasion remains unconfirmed.