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.
Seaforth Highlanders The Seaforth Highlanders (Ross-shire Buffs, The Duke of Albany's) was a historic line infantry regiment of the British Army, mainly associated with large areas of the northern Highlands of Scotland. The regiment existed from 1881 to 1961, and saw service in World War I and World War II, along with many numerous smaller conflicts. In 1961 the regiment was amalgamated with the Queen's Own Cameron Highlanders to form the Queen's Own Highlanders (Seaforth and Camerons), which merged, in 1994, with the Gordon Highlanders to form the Highlanders (Seaforth, Gordons and Camerons). This, however, later joined the Royal Scots Borderers, the Black Watch, the Royal Highland Fusiliers (Princess Margaret's Own Glasgow and Ayrshire Regiment) and the Argyll and Sutherland Highlanders to create the present Royal Regiment of Scotland.