One more point of interest is that this is where Gunter Grass served for about 6 months from Autumn 1943 to Spring 1944 as a 16-year-old in a Luftwaffe Auxiliary Unit.
"Shortly after my sixteenth birthday I was transferred with part of the Kaiserhafen team to the Brosen-Glettkau beach battery, which was equipped with four-barrelled anti-aircraft artillery to protect the nearby airport from strafing. There we had more rabbits than long-tailed (rats) quarry.
The waves broke monotonously against the battery’s beach position. Rifle practice consisted of shooting at rabbits or – though it was forbidden- seagulls with small-calibre weapons." Gunter Grass, Peeling the Onion, 2007.
Only part of the battery remains and is in poor condition, clearly these days serving as a public toilet and shelter.