![Hackness Martello Towers and Battery, guarded the southern entrance to Scapa Flow, Hoy island, Orkney islands, Scotland Stock Photo - Alamy Hackness Martello Towers and Battery, guarded the southern entrance to Scapa Flow, Hoy island, Orkney islands, Scotland Stock Photo - Alamy](https://c8.alamy.com/comp/E8RM0K/hackness-martello-towers-and-battery-guarded-the-southern-entrance-E8RM0K.jpg)
Hackness Martello Towers and Battery, guarded the southern entrance to Scapa Flow, Hoy island, Orkney islands, Scotland Stock Photo - Alamy
![Hackness Battery, Hoy. 64-pounder gun on the roof of the Martello Tower at Hackness, Hoy, Orkney Stock Photo - Alamy Hackness Battery, Hoy. 64-pounder gun on the roof of the Martello Tower at Hackness, Hoy, Orkney Stock Photo - Alamy](https://c8.alamy.com/comp/DC5PH2/hackness-battery-hoy-64-pounder-gun-on-the-roof-of-the-martello-tower-DC5PH2.jpg)
Hackness Battery, Hoy. 64-pounder gun on the roof of the Martello Tower at Hackness, Hoy, Orkney Stock Photo - Alamy
![Hackness Martello Towers and Battery, guarded the southern entrance to Scapa Flow, Hoy island, Orkney islands, Scotland Stock Photo - Alamy Hackness Martello Towers and Battery, guarded the southern entrance to Scapa Flow, Hoy island, Orkney islands, Scotland Stock Photo - Alamy](https://c8.alamy.com/comp/E8RM0H/hackness-martello-towers-and-battery-guarded-the-southern-entrance-E8RM0H.jpg)