List of battalions of the Argyll and Sutherland Highlanders (Princess Louise's)

When the 91st (Argyllshire Highlanders) Regiment of Foot amalgamated with the 93rd (Sutherland Highlanders) Regiment of Foot, to become Princess Louise's (Sutherland and Argyll Highlanders) in 1881 under the Cardwell-Childers reforms of the British Armed Forces, nine pre-existent militia and volunteer battalions of Argyllshire, Buteshire, Dumbartonshire, Kinross-shire, Renfrewshire, and Stirlingshire were integrated into the structure of the regiment. Volunteer battalions had been created in reaction to a perceived threat of invasion by France in the late 1850s. Organised as "rifle volunteer corps", they were independent of the British Army and composed primarily of the middle class.

The Territorial Force (later Territorial Army) was formed in 1908, which the volunteer battalions joined, while the militia battalions transferred to the "Special Reserve". All volunteer battalions were renumbered to create a single sequential order.[9]

The Argyll and Sutherland Highlanders fielded 27 battalions and lost over 6,900 officers and other ranks during the course of the war.[10] The regiment's territorial components formed duplicate second and third line battalions. As an example, the battalions of the 5th Argyll and Sutherland Highlanders were numbered as the 1/5th, 2/5th, and 3/5th respectively, with the 3rd line battalion becoming reserve battalions later on in the war.

By 1921, all of the regiment's war-raised battalions had disbanded. The Argyll and Sutherland Highlanders did not, however, return to its original peacetime size; two of its territorial battalions were amalgamated shortly after the war ended. The Special Reserve reverted to its militia designation in 1921, then to the Supplementary Reserve in 1924; however, its battalions were effectively placed in 'suspended animation'. As World War II approached, the Territorial Army was reorganised in the mid-1930s and many of its infantry battalions were converted to other roles, especially anti-aircraft.

The Argyll and Sutherland Highlanders expansion during the Second World War was modest compared to 1914–1918. National Defence Companies were combined to create a new "Home Defence" battalion, and in addition to this, a number of battalion and batteries of the Home Guard were affiliated to the regiment.

In the immediate post-war period, the army was significantly reduced: nearly all infantry regiments had their first and second battalions amalgamated and the Supplementary Reserve disbanded.

The Argyll and Sutherland Highlanders, was amalgamated with the Royal Scots, King's Own Scottish Borderers, Royal Highland Fusiliers, Black Watch, and the Highlanders (Seaforth, Gordons and Camerons), to form the Royal Regiment of Scotland in 2006, under Delivering Security in a Changing World. The 1st battalion became the 5th Battalion, Royal Regiment of Scotland.