"In his book, The Account of the Chinese War, published in 1844, Lieutenant John Ochterlony of the Madras Engineers, mentioned a battery on Kellett's (sic) Island manned by a detachment of Madras Artillery. Although probably a temporary battery when first established, this battery would appear to be the first defensive structure to be built in Hong Kong."
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1840s Kellett Island
"In his book, The Account of the Chinese War, published in 1844, Lieutenant John Ochterlony of the Madras Engineers, mentioned a battery on Kellett's (sic) Island manned by a detachment of Madras Artillery. Although probably a temporary battery when first established, this battery would appear to be the first defensive structure to be built in Hong Kong."
Source: Britain's Island Fortresses by Bill Clements