Early in 1918, elements of the Norfolk Regiment, including Moeran's 1/6th battalion, were transferred to Ireland to support efforts to control escalating Nationalist disturbances. While the exact date of this deployment is not known, it was probably during the first two weeks of February. This is suggested by the fact that Moeran did not play the piano accompaniment in the first performance of his Four Songs from ‘A Shropshire Lad’ at the musical club on 14 February. He was still in some discomfort from his injury, and, on his arrival in Ireland, he was again required to attend several Medical Boards. The first of these was dated 23 March, and it confirms that he was based at Boyle Barracks in County Roscommon. The Medical Board itself was held at the King George V Hospital in Dublin, to which it may be presumed that Moeran travelled from Boyle. No mention is made of the pain from which he had been suffering a few weeks earlier, and the conclusion of the Report was that ‘He has considerably improved since [the] last board [and] [h]e is now fit for general service: instructed to rejoin [sic] his present unit.’

Moeran was still assigned to light duties, with dispatch riding being the most likely activity, particularly since this is how he chose to recall his wartime experiences in later life. He was evidently able to travel around the country to some extent, the main evidence for this deriving from a manuscript notebook in the possession of Trinity College Library in Dublin and catalogued as Moeran's Last Notebook. During the mid-1940s, Moeran transcribed musical examples and compositional notes into a notebook he had acquired for the purpose, and this notebook contains information that is useful both in examining his music and in tracing his locations. However, when he compiled the notebook from his original manuscripts, it is probable that he mis-remembered or mis-transcribed dates that he had originally recorded, and so the evidence must be considered in the contexts of unreliable memories, poor handwriting and an agenda to reconstruct his own past. While some of the dates recorded are undeniably incorrect, it would be unrealistic to assume that they are all either wrong or misleading. Nonetheless, Moeran's imprecision has left the biographer with a conundrum, and a decision must be made as to which dates are to be regarded as dependable.