1587, against the Spanish
The Armada fort
Elizabeth I's engineers built the present star fort in 1587-88 to keep the Spanish Armada out of Waterford Harbour. The pentagon-and-bastion design was Italian, the panic was English, and the ships never came. The fort got built anyway and has been on the headland ever since. The community runs the tours now; the county council owns the keys.
1649-1650
Cromwell did not take it
Cromwell laid siege to Duncannon Fort in 1649 and failed. He moved on to Waterford and failed there too, then retired to winter quarters muttering. The fort eventually surrendered the following year to Henry Ireton, after a blockade rather than an assault. Duncannon is one of the few places in the country that genuinely held Cromwell up.
3 July 1690
King James' Hole
After the Battle of the Boyne went badly, James II rode south to Duncannon and on 3 July 1690 sailed from the slip beneath the fort to Kinsale, then to France, then to history. The slip is still called King James' Hole. Two months later King William III sheltered in the same fort waiting for the weather to turn for England. Two kings, one fort, one summer.
August Bank Holiday
The sand-sculpting weekend
On the August Bank Holiday weekend the village hosts the Duncannon Sand Sculpting Festival on the beach. Big tent, professional carvers, fireworks on the Sunday night, crab-fishing competition off the pier, every B&B booked solid. It is the busiest the village gets all year. If you want a quiet beach, do not come that weekend.