<p>From archive records, the two first world war vintage 12-pdr guns had been relocated here by 1942 from Signal Hill and Arrow Point. The guns had a range of 9,600 yards (8.8km) and were designated as the examination battery for ships anchored in Port William. There was also a command post and 9' rangefinder described as being "well sited."
</p><p>It appears as if the battery had not been decommissioned, but placed into a state of preservation. The barrels had been blocked at the muzzle by an unfired shell, and the breech on each gun with a wooden plug that has been tarred in position. The evidence of ammunition crates strewn around the ready use lockers and small magazine on site also suggest the site had not been fully stripped. 
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The site sits on the private land of Murrell Farm, and tours (mainly of the penguins) can be taken by contacting Kidney Island Tours.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/147447263@N02">Nick /</a> from United Kingdom
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/intrepidexplorer82/51055847466/">Rangefinder plinth</a>