Just to be clear, before the start of the First World War the East Lancs had two Regular Battalions, 1st and 2nd, and a 3rd Special Reserve Battalion. The Special Reserve was formed from the old Militia which had effectively been disbanded in 1908 when the Territorial Force was created. The role of the Special Reserve was to act as a pool of individual reservists to replace casualties in the 1st and 2nd Battalions, and also to perform a home guard role. Members of the 3rd Battalion were part-timers until they were mobilised in the Summer of 1914.
Prior to the start of the war the 2nd Battalion was in South Africa, and the 1st Battalion was stationed in Colchester. Neither had been in Ireland for at least 6 years prior to 1914.