A Second World War Heavy Anti Aircraft (HAA) battery can be seen on aerial photographs taken in 1950. This battery is situated on the north side of Dillywood Lane, east of Higham and was part of the Thames & Medway Gun Defended Area. It was numbered TS9 and named Oak Street. The battery is first seen on aerial photographs taken in 1942 and its layout of guns and associated roadway suggests that it was constructed before or early in the Second World War. The south-western corner of the site was occupied by the domestic buildings, the north-east by the guns. Immediately to the east was the GL mat; this was not photographed in its entirety and its position on the map is approximate. This was under construction in 1942 as were additional buildings within the domestic quarters. Post-war photographs show that two further emplacements and additional buildings within the domestic quarters had been built at the site. A number of allotments can also be seen. Aerial photographs taken in 2007 show the area is now occupied by a garden centre and two houses. All but one of the domestic buildings had been demolished by this date. One gun emplacement clearly survives as does the original magazine. The command post and a second emplacement appear to be covered with soil. A third emplacement may partially survive beneath a mound although part of it has been demolished to make way for a swimming pool. The remaining gun emplacements have been demolished. This site was mapped from aerial photographs as part of the English Heritage: Hoo Peninsula Landscape Project.