Upon the regiment's creation the territorial battalions of both predecessor regiments were transferred, without a change in name. These were:
4th (Volunteer) Battalion In 1975, control of the territorial units was passed back to the affiliated regiments, and so the regiment formed 4th (Volunteer) Battalion, from companies of the Lancastrian Volunteers and Northumbrian Volunteers. • HQ Company, at Lancaster • A Company, at
Carlisle, with platoon at
Workington,
from A Company, 1st Battalion, Lancastrian Volunteers • B Company, at Lancaster, with platoon at
Barrow-in-Furness,
from E Company, 1st Battalion, Lancastrian Volunteers • C Company, at Kendal,
from B Company, Northumbrian Volunteers 1984 saw the establishment of E (
Home Service Force) Company, with a platoon stationed with each company, however this was disbanded along with the rest of the HSF in 1992. At the same time, the battalion was reduced down to a HQ Company, and 3 rifle companies and retained this structure until amalgamation in 1999. • HQ Company, at Lancaster • A Company, at Carlisle, with platoon at Workington • C Company, at Barrow-in-Furness • D Company, at Workington The battalion amalgamated with the 4th (Volunteer) Battalion, Queen's Lancashire Regiment, in 1999, to form the
Lancastrian and Cumbrian Volunteers; HQ and C Companies amalgamated to form A (Tobruk) (King's Own Royal Border Regiment) Company, and A and D Companies amalgamated to form C (Sicily) (King's Own Royal Border Regiment) Company, of the new regiment. The Lancastrian and Cumbrian Volunteers later amalgamated with the two King's Companies of the King's and Cheshire Regiment, to form
4th Battalion, Duke of Lancaster's Regiment, with the KORBR lineage being maintained by C (Kohima) Company, spread across Workington, Carlisle, Barrow, and Lancaster. ==Regimental museum==