The intercept site was on Stonecutters Island, four miles across the harbour, and manned by a dozen RAF and RN ratings (plus later four Army signallers).
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Defensive headquarters were located at Shing Mun Redoubt, which had an observation post (acting as Headquarters of the redoubt) that could call artillery support from Mount Davis battery and Stonecutters Island Fort, and four pillboxes (PB400-403) fitted with Vickers machine gun and Bren LMG.