Completed during the early 1940s, the role of Leighton Battery at Buckland Hill in Mosman Park, was to watch for enemy ships arriving on Gage Road, the outer harbour strip of Fremantle Harbour in the Indian Ocean.

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Four 3.7 inch anti-aircraft guns were moved to Buckland Hill in 1941 and became operational towards the end of the year.

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Three 6 inch guns were moved from Arthur Head in Fremantle to Leighton Battery in January/February, 1943.