[10][11] The 1st Battalion landed at Le Havre as part of the 25th Brigade in the 8th Division in November 1914 for service on the Western Front.

[20] In 1937 the already close relationship with the London Irish Rifles was formally recognised when they were incorporated into the Corps while still retaining their regimental identity as a territorial battalion.

[21] When war was declared the 1st Battalion was serving in India, with the 31st Independent Brigade Group, which was trained in mountain warfare.

[23] Carried in Horsa gliders, the battalion took part in Operation Mallard, the British glider-borne landings in the later afternoon of 6 June 1944, otherwise known as D-Day.

200 Group National Defence Companies and consisting of older men with previous military experience who were unfit for active service.

[11] The 8th Battalion, Royal Ulster Rifles, was also raised in 1940, and joined 203rd Independent Infantry Brigade (Home).

In September 1943 the regiment landed in Italy shortly after the initial invasion, now as part of the British Eighth Army, and served on the Italian Front until June 1944, when the regiment was broken up and the men were retrained as infantrymen, due to a severe shortage of infantrymen, particularly in Italy.

The battalion spent most of its time guarding airfields and aerodromes before moving to Great Britain in October 1941.

[11] The 1st Battalion, Royal Ulster Rifles disembarked at Pusan in early November 1950 as part of the 29th Independent Infantry Brigade Group for service in the Korean War.

As the New Year started, the Fiftieth Chinese Communist Army engaged the United Nations troops focusing on 29 Brigade, who were dispersed over a very wide front (12 miles).

With virtually no cover and seriously outnumbered, the Royal Ulster Rifles came under heavy fire as they withdrew to a blocking position.

The Brigade was able to hold its position, despite fierce fighting, and neutralized the effectiveness of the Sixty-fourth Chinese Communist Army.

As pride, sobered by mourning for fallen observes how well these young men have acquitted themselves in remotest Asia.

[34] It stood overlooking the battlefield until 1962 when Seoul's growth threatened to consume it, and it was carried by HMS Belfast back to Ireland where it was the focus of St Patrick's Barracks in Ballymena.

[33] When the barracks closed in 2008, the Imjin River Memorial was again moved, this time to the grounds of the Belfast City Hall.

[35] The Regiment continued to accept recruits from the rest of Ireland; for example, almost 50% of personnel in the 1st Battalion who arrived in Korea in 1950 were Irish nationals.

The museum's artefacts include uniforms, badges, medals, regimental memorabilia, trophies, paintings and photographs.