Much data has been written about the involvement of Glaslough & many of its residents in the Rebellion of 1798. My wife's ancestor - Colonel Charles Johnston was arrested with 50 others on the information of Alexander Byers in 1797. Byers was the brother-in-law of William Murphy who had previously given evidence against George Johnston of Derryhallagh. All of these Johnstons are from the Derryhallagh (aka Fort Johnston, Tully, Straghan etc) which was an Estate in that area. Most famous was Baptist Johnston, second-in-command to Major Anketell at the Battle of Drumbanagher in 1688, believed to be one of the first battles of the Williamite War. The Presbyterians (of Glennan & elsewhere in Ireland) had previously had no right to baptize, conduct weddings or officiate at their funerals. This was the major reason for the 1798 Rebellion and the other events (Vinegar Hill etc) happened later as the Rebellion gained momentum. In fact, Henry Joy McCracken, himself a Presbyterian & printer of a Belfast Newspaper, took part in the Battle of Antrim.
Colonel Charles Johnston, an Army Colonel, & later a Colonel in the United Irishmen, was tried in October 1797 & was sentenced to be hanged.
In December 1998, 200 years after the Rebellion, Sir John Leslie unveiled a plaque in Glaslough to commemmorate those of Glaslough who were hanged as a result of the Rebellion.