I have found reference to this particular unit (Irish Regiment but obviously with the Munster title). Disbanded in 1922, but saw action in WW1 (alot). Seems to have history from the East India Company, where it was formed from two previous Fusilier Regimetns and the 'Militia of Munster'... I can't find any information about this last unit. Anyone have any info? Alas the unit was disbanded rather than amalgamated, so it is unlikely the history has passed on to any other regiment in the British Army, unless there is an Irish unit with a claim.