Sligo's 17th Century FortsSligo’s 17th‑century forts form a small but fascinating network of defensive earthworks built during one of the most turbulent periods in Irish history.
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The Green Fort
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Sligo’s 17th‑century forts form a small but fascinating network of defensive earthworks built during one of the most turbulent periods in Irish history. The most important — and the only one still visibly standing — is Green Fort, but historical records show it was part of a broader system of fortifications protecting the town during the Nine Years War, Confederate Wars, and Williamite Wars.
Standing prominently within O’Dowd Park, Green Fort occupies a commanding position above Sligo town. Built around 1599–1600, this bastioned artillery fort was engineered to deflect cannon fire — a cutting‑edge design for its time. Its elevated location provided sweeping views over the town, harbour, and key approach routes. Walking the site today, you can still trace the earthen ramparts that once shielded defenders from artillery attack. Unlike stone fortifications, which could be shattered by cannon fire, earthen walls absorbed impact and were easier to repair. Green Fort is now the only remaining visible element of Sligo’s 17th‑century defensive system and one of Ireland’s few surviving earthen star forts. Green Fort was strategically vital because:
Recent excavations have transformed our understanding of the site. Over 1,000 artefacts have been uncovered, including:
These finds offer a vivid glimpse into the daily life of soldiers stationed at the fort. Archaeologists also discovered that Green Fort was built on top of an earlier ringfort (Ráith dá Briotócc), revealing that the hill had been a strategic location long before the 17th century. |
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