High Knoll Fort at Redhill once served as the citadel of last refuge for the inhabitants of St Helena Island. The tower was built in 1798 and the outer walls and gate completed in 1874.
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High Knoll Fort (1874) on a hilltop in the center of St Helena Island was well protected by high stone walls. The most dangerous Boer prisoners were held here during the Anglo-Boer War.
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High Knoll Fort (1874) above Half Tree Hollow on St Helena Island could accommodate the entire population of the island in case of enemy invasion.
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The Jamestown suburb of Half Tree Hollow occupies a plateau sloping down from High Knoll Fort on St Helena Island.
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Prince Andrew School occupies an elevated plateau on Francis Plain in central St Helena Island.
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