A number of coastal fortifications were built in County Cork, Ireland, to defend the county's coastline, and in particular the strategic berths at Cork Harbour, Kinsale Harbour, Berehaven and Bantry Bay. The fortifications initially included medieval tower houses built to defend strategic points (14th-17th centuries), subsequent Martello towers designed to counter threatened French invasion (18th-19th centuries), and later Palmerston Forts to further improve coastal defence (19th century). The latter were subsequently updated with longer-range coastal artillery - to support the naval defence of the "Western Approaches" during the First World War (early 20th century).
Build in 1743 to replace temporary batteries defending the berths at Cobh and Haulbowline.[7] Now the site of a Port of Cork facility and memorial garden.
Towers at Ringaskiddy, Haulbowline, Belvelly, Rossleague and Marino Point. The latter, "Monning Tower", was briefly held by Captain Mackey during the 1867 Fenian Rising.[9] Haulbowline tower is now a museum store.[10] One is a residence.[11]
From medieval times, the harbour and berths at Kinsale were of strategic importance, and its defences were tested during the Battle of Kinsale (1601) and Williamite War (1690). Though declining in importance (relative to those at Cork Harbour) in the 18th and 19th centuries, several structures were in use until they were burned during the Irish Civil War (1922).
Built to defend the deep water berths of Bantry Bay, four towers were built on Bere Island (2 remain), with others on Whiddy and Garnish.[18]
Baltimore and Roaring Water Bay
The defences at Baltimore, Roaring Water Bay and surrounding islands were largely built by landed families from the 14th to 17th centuries. Some were relinquished (but later returned) after the Nine Years' War (1603) and involved in the Sack of Baltimore (1631).
Built by the O'Driscolls in the same period as the island's friary, Sherkin's Dún na Long (Fort of the Ships) and Cléire's Dún an Óir (Fort of Gold, pictured) were intended to defend the approaches to Baltimore and Roaring Water Bay
^"Notes and queries: The Martello towers of Cork harbour". Journal of the Cork Historical and Archaeological Society. Cork Historical and Archaeological Society: 200. 1907.