Scots Mercenary Forces in Ireland (1565-1603). An Account of their Service during that Period, of the Reaction of their Activities on Scottish Affairs, and of the Effect of their Presence in Ireland. Together With an Examination of The Gallóglaigh or Galloglas. With an Introduction by Prof. Eoin MacNeill. Dublin: Burnes, 1937. First Edition. Pp xxi, 391. Green cloth boards, title in gilt to spine. Light shelf-wear to boards, contents pages in good condition.

Frontispiece Portrait of James VI, of Scotland, with two maps a folded Genealogies of the MacSweeneys, MacDonalds & O’Neils at rear. Including an extensive bibliography and index.

The expanded book edition of Hayes-McCoy’s doctoral thesis containing meticulous archival research. It anticipated by sixty years the much vaunted New British History of the late twentieth century by tracing the interconnections between events in England, Ireland, and Scotland.