[6] The 2nd battalion was stationed in Ireland from 1886 to 1894, and in late 1899 embarked for South Africa as part of the reinforcements for the Second Boer War.

[7] Following the end of the war in South Africa in 1902, the battalion went to India on the SS Syria in January 1903,[8] where it was stationed at Ranikhet in Bengal.

[10] The 1/4th Battalion served in India before landing at Le Havre as part of the 159th Brigade in the 53rd (Welsh) Division in July 1917 for service on the Western Front.

[10] It made an important counter-attack against the Germans at Bligny in June 1918 during the Spring Offensive for which it was awarded the French Croix de Guerre.

[10] The 8th (Service) Battalion landed in France as part of the 66th Brigade in the 22nd Division in September 1915 but sailed to Salonika in November 1915.

[12] On 7 September 1919, during the Irish War of Independence following the war in Europe, the KSLI suffered the British Army's first casualties at the hands of the IRA when a detachment from a unit stationed at Fermoy was ambushed on a church parade by an IRA unit under the command of Liam Lynch; one soldier was killed, four wounded and the rest disarmed by the motor-borne raiders.

A further journey followed to Minden Barracks in Cologne in 1924 as part of the garrison of the demilitarised Rhineland, and across the river in January 1926 to Wiesbaden, where its band played the regular round of paid civilian engagements as well as appearing at both the 1924 and 1925 Empire Exhibitions at Wembley.

[2] Corporal Thomas Priday was killed by a land mine near Metz on 9 December 1939 when the 1st Battalion was based near the Maginot Line as part of the original British Expeditionary Force that was sent to France at the outbreak of war.

[2] They spent many months training in preparation for Operation Overlord and the 4th KSLI, like the 2nd Battalion, also served with distinction in the North West Europe Campaign.

In October 1944, Sergeant George Harold Eardley of the 4th Battalion was awarded the Victoria Cross for his part in knocking out multiple enemy machine guns.

[16] A hostilities-only unit, the 6th Battalion was raised in June 1940 and assigned to the 204th Independent Infantry Brigade (Home), later part of Lincolnshire County Division.

[19][20] The Shropshire Gunners supported 15th (Scottish) throughout the North West Europe Campaign from Normandy to Germany, being the first field artillery regiment across both the Rhine and the Elbe.

[23] The KSLI was to participate in Korean War and was the longest-serving British regiment, alongside the King's Own Scottish Borderers.