The attached New Zealand Antique & Historical Arms Association Inc.News Letter, # 54 July 2015, has a very interesting article about the Pol Hill Gun AA Battery – Wellington.  
“Not far from the central Wellington at the Pol Hill Reserve in the suburb of Brooklyn are the remains of the Pol Hill Heavy Anti Aircraft Battery where four 3.7″ AA guns, a command post and accommodation for 109 man were ready to defend the capital should the anticipated Japanese Invasion have eventuated, those manning the defenses drilled, watched and waited yet never fired a shot in anger In 1942 when construction commenced this would have been quite a remote and challenging locality,”  Click here to vew the news letter.