Williamites: unknown total but Schomberg landed six cavalry and nine infantry regiments plus naval support; Jacobites: approximately 500 (Charles MacCarthy More's infantry regiment plus nine companies of Cormac O'Neill's regiment)
The siege of Carrickfergus took place in August 1689 when a force of Williamite troops under Marshal Schomberg landed and laid siege to the Jacobite garrison of Carrickfergus in Ireland. After a week the Jacobites surrendered, and were allowed to march out with the honours of war.
Carrickfergus was a traditional stronghold of the Crown in Ulster, commanded by the Norman-era Carrickfergus Castle. During 1689 with its Irish Army garrison, it became a refuge for Catholic inhabitants of the region to flee to as the northern rebellion against James II's rule grew. In February 1689 local Protestant forces made a failed attempt to storm the town.
After the Break of Dromore on 14 March, Richard Hamilton's Jacobite forces had swept through Eastern Ulster bringing all of County Down and Antrim under their control. Carrickfergus and its surrounding area were securely under Jacobite rule as Hamilton advanced to lay siege to Derry, one of the few remaining Protestant strongholds in Ireland. What had initially seemed as though it would be a quick victory began to drag out through the summer, particularly as some Jacobite forces had to be diverted to confront the defenders of Enniskillen. Meanwhile, a series of relief forces were being prepared in England. Percy Kirke led an expedition to Derry, where the siege was finally broken on 28 July. In the face of the sudden defeat, Jacobite forces began to withdraw from Derry and employed a scorched earth policy as they retreated.
A second major wave of reinforcements was assembled at Chester under the veteran Huguenot commander Frederick Schomberg, 1st Duke of Schomberg. While it was originally suggested that they might head for Cork, it was decided that they should be landed in Ulster. By the time the expedition sailed from Hoylake on 12 August 1689, news of the relief of Derry had reached England. It meant that Schomberg could now act offensively. During a council of war, the expedition's officers decided to make for Belfast Lough rather than Carlingford Lough, allowing them to join up with the advancing Irish Protestant forces of Derry and Enniskillen.
By 13 August the expedition was in sight of the Mountains of Mourne. They were accompanied into Bangor Bay by George Rooke who had led a Royal Navy force to clear Belfast Lough of French shipping. The same afternoon Schomberg began disembarking his men. He kept them at the alert in case the Jacobite garrisons of nearby Belfast, Bangor and Carrickfergus should attack, but there was no opposition as the troops were brought ashore. The artillery and supply ships arrived separately a few days later. By the end of August, a total of six cavalry and nine infantry regiments had been landed safely at Carrickfergus.
The site of Siege of Carrickfergus lies on Mercia Mudstone Group, bedrock that formed in the Rhaetian. The rock here is mudstone, sandstone and limestone.
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