The regiment that the 6th Battalion, Ulster Defence Regiment grouped into had who as their oldest predecessor?
Royal Irish Regiment (1992) The Royal Irish Regiment (27th (Inniskilling) 83rd and 87th and Ulster Defence Regiment) (R IRISH) is an infantry regiment of the British Army. The regiment was founded in 1992 through the amalgamation of the Royal Irish Rangers and the Ulster Defence Regiment. Their oldest predecessor; the 27th Regiment of Foot; was first raised in June 1689 to fight in the Williamite War in Ireland. Other notable regiments in their lineage include the Royal Inniskilling Fusiliers, Royal Irish Rifles and the Royal Irish Fusiliers (Princess Victoria's).
2/1st Black Watch Brigade The 2/1st Black Watch Brigade was a 2nd Line Territorial Force infantry brigade of the British Army in World War I. The brigade was formed as a duplicate of the Black Watch Brigade in January 1915. As the name would suggest, it was organized with four battalions of the Black Watch (Royal Highlanders), It was dissolved in November 1915 as its constituent battalions were posted to other formations.