Coastal Defence There are many coastal defence batteries dotted about Orkney. All are in prominent locations and make interesting visits. They were built during WWI and WWII to defend against raing German E Boats and naval ships. There were also many anti-aircraft sites all over the islands, some of which still remain, but most of which have been cleared away now. 6-pounder gun Buchanan, Flotta Buchanan, Flotta Graemeshall, Holm Graemeshall' Holm Hoxa Head Hoxa Head Hoxa Head Hoxa Head Oxan Point Rerwick Head Rerwick Head Saltness, Shapinsay Saltness, Shapinsay Saltness, Shapinsay searchlight