The regiment that the 6th Battalion, Ulster Defence Regiment grouped into had who as their oldest predecessor?
6th Battalion, Ulster Defence Regiment The 6th (County Tyrone) Battalion, Ulster Defence Regiment (6 UDR) was formed in 1970 as part of the seven original battalions specified in The Ulster Defence Regiment Act 1969, which received Royal Assent on 18 December 1969 and was brought into force on 1 January 1970. It was, along with the rest of the regiment, amalgamated with the Royal Irish Rangers in 1992 to form the Royal Irish Regiment.
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.