Sitting within the Medway District, the anti-aircraft emplacement at Lodge Hill is seen as having national significance, and as such was scheduled under the Ancient Monuments and Archaeological Areas Act 1979 (reference) in 2012, and it is believed that this site, and its ‘sister’ site at Beacon Hill are the earliest examples of anti-aircraft defences in Britain. The site is now over 100 years old, being constructed around 1913, it was later re-armed during the Second World War twenty years after construction. This site, along with the emplacements (no longer extant) at Beacon Hill, and a number of other Grade II listed sentry posts at Lodge Hill and Chattenden form a formidable set of First World War defences almost unique to this area built to protect the nearby ordnance depots. Initially the site would have housed around 35 men, 11 each to man the 6 inch breech loaded howitzers, with the remainder in command and control functions. Later on in its service the site was fitted with a 3 inch quick-firing (QF) gun and a 1 pounder 37mm quick-firing Pom-Pom gun. By 1917 the site had been disarmed and appeared not to be in use.
With a new lease of life in WW2, the site housed a Z-battery of anti-aircraft rockets, prompting some modification and reworking of the existing structures; the rocket battery was housed to the west of the site, and the southern emplacement had been mostly demolished at this stage.
I have visited this site a couple of times now, taking photographs of the existing works. Below are some of the images I took.