Walled city of Derry

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Siege Boom (Heritage Trail)

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Below the Foyle Bridge, on the northern side, is the site of a boom or floating barrier constructed during the siege of 1689. It was broken by three ships-the 'Mountjoy,' 'Dartmouth,' and the 'Swallow' on the 29th July 1689 to bring relief to the besieged city and an end to the siege.