Beauchamp Bagenal Harvey (died 28 June 1798) was a barrister and a commander of the United Irishmen in the Battle of New Ross during the 1798 Rebellion. He was the eldest son of Francis Harvey of Bargy Castle, Wexford, who was one of the six Clerks in Chancery, and his wife and cousin Nartha Harvey. Bagenal was educated at Trinity College, Dublin. During his years in Dublin he entered a relationship with Elizabeth Smith, with whom he had two sons. He was a Protestant who was known for his liberal principles and as a supporter of Catholic emancipation. From June 1792 he was a member of the Dublin Society of United Irishmen, founded by James Napper Tandy and Archibald Hamilton Rowan. Just before the outbreak of the 1798 Rebellion Harvey was arrested at his home on 26 May 1798 at 11.00 p.m. A rebel colonel, Anthony Perry, divulged the information after giving in to torture by Crown forces. He was imprisoned at Wexford Gaol until its occupation by the rebels, and on his liberation, he was appointed Commander-in-Chief of the rebel forces, perhaps against his will. His first plan was to advance westwards via New Ross into County Kilkenny in hope of finding new supporters for the rebellion. Battle of New Ross Harvey was in command at the Battle of New Ross on 5 June 1798, in which the rebels were defeated. The rebels outnumbered the British force and had a rebel emissary Matt Furlong deliver surrender terms. While bearing a flag of truce Furlong was shot, prompting 500 of the rebels under John Kelly of Killanne to charge. The attack had some initial success with two-thirds of the town in possession of the United Irishmen. They quickly ran out of ammunition and were forced to rely on their pikes. With the arrival of British reinforcements, the rebels were defeated. Flight, arrest and execution On 7 June Harvey resigned at Sliabh Coillte, disgusted with his defeat and the ensuing Scullabogue Barn massacre. He was replaced as Commander-in-Chief by Philip Roche and returned to Wexford where he was appointed President of the town committee. Confident that a treaty would be negotiated on the rebels' behalf by Lord Kingsborough, the captured loyalist commander of the North Cork Militia, he retired to his family home at Bargy Castle. Shortly afterwards he and John Henry Colclough, dressed as peasants, travelled to a cave on