WWII Anti-Aircraft Battery adjacent to Thistleboon Common, Mumbles. The 623rd Heavy Anti-Aircraft Battery comprised of a Control bunker with underground command post, offices and plotting room, and four 3.7" AA guns in round, brick-walled emplacement, to the north. The round emplacements were replaced in 1944 with two square ones, located to the east.


Photographed during aerial reconnaissance by RCAHMW on 4th March 2008.
L. Osborne, 13th June 2012.