On the background and importance of the poem by Eoghan Ruadh Mac an Bhaird. This poem and Fogas furtacht don tír thuaidh composed c. 1625-27 for Aodh Ó Domhnaill. Suggests that the leabhrán referred to is Lipsius’s De militia Romana libri quinque [. . .]. New edition (15 qq.) of poem with previously unpublished prose introduction. Ed. from MS NLI G 167.