Irish Rebellion of 1798: The British Army defeats Irish rebels at the Battle of Vinegar Hill.

The Irish Rebellion of 1798 was a popular insurrection against the British Crown in what was then the separate, but subordinate, Kingdom of Ireland. The main organising force was the Society of United Irishmen. First formed in Belfast by Presbyterians opposed to the landed Anglican establishment, the Society, despairing of reform, sought to secure a republic through a revolutionary union with the country's Catholic majority. The grievances of a rack-rented tenantry drove recruitment.

The Battle of Vinegar Hill was a military engagement during the Irish Rebellion of 1798 on 21 June 1798 between a force of approximately 13,000 government troops under the command of Gerard Lake and 16,000 United Irishmen rebels led by Anthony Perry. The battle, a major rebel defeat, took place on 21 June 1798 on a large rebel camp on Vinegar Hill and in the streets of Enniscorthy, County Wexford and marked the last major attempt by the rebels to hold and control territory taken in Wexford.