Located in Dymchurch, England, the Dymchurch Martello Tower is a Martello tower located adjacent to the sea wall of the English Channel.  The towers, ranging along the Kent and East Sussex shoreline, were built in the early 1800s as a coastal defence programme against a threatened French invasion under Napoleon. This one is the 24th of 75 such towers built.  At the top is a 24-pounder muzzle-loading cannon on the gun platform.

The nearby blue plaque reads the following:

This plaque commemorates the sighting of the first VI flying bomb to enter the UK in World War II by the Royal Observer Corps Dymchurch post on 13th June 1944

www.roc-heritage.co.uk

Forewarned is forearmed

From: https://en.wikipedia.org/wiki/Dymchurch_Martello_Tower