5th Royal Irish Lancers  The 5th Royal Irish Lancers was a cavalry regiment of the British Army. It saw service for three centuries, including the First World War. It amalgamated with the 16th The Queen's Lancers to become the 16th/5th Lancers in 1922. The regiment was originally formed in 1689 by Brigadier James Wynne as James Wynne's Regiment of Dragoons. It fought at the Battle of the Boyne in July 1690 and at the Battle of Aughrim later that month under King William III. Renamed the Royal Dragoons of Ireland in 1704, it went on to fight under the Duke of Marlborough at the Battle of Blenheim in August 1704 during the War of the Spanish Succession. At the Battle of Ramillies in May 1706 the regiment helped capture the entire French "Regiment du Roi", after which it fought at the Battle of Oudenarde in July 1708 and at the Battle of Malplaquet in September 1709. In 1751, it was retitled 5th Regiment of Dragoons and in 1756 it became the 5th (or Royal Irish) Regiment of Dragoons. As such, it served in Ireland and had the honour of leading the charge against the rebels at the Battle of Enniscorthy in May 1798 during the Irish Rebellion of 1798. However, its troops were accused of treachery: their accusers claimed their ranks had been infiltrated by rebels. Following an investigation, it was found that a single individual, James M'Nassar, had infiltrated the regiment: he was ordered to be "transported beyond the seas". According to "Continental Magazine":  The circumstance was commemorated in a curious way. It was ordered that the 5th Royal Irish Light Dragoons should be erased from the records of the army list, in which a blank between the 4th and 6th Dragoons should remain forever, as a memorial of disgrace. For upward of half a century this gap remained in the army list, as anybody may see by referring to any number of that publication of half-a-dozen years back. The regiment was reformed in 1858, keeping its old number and title, but losing precedence, being ranked after the 17th Lancers. It was immediately converted into a lancer regiment and titled 5th (or Royal Irish) Regiment of Dragoons (Lancers). In 1861, it was renamed the 5th (or Royal Irish) Lancers and then the 5th (Royal Irish) Lancers.