Many people think that the Spanish Armada of 1588 was the only fleet sent to harass England; it was one of more than a few, especially during the period of the First Anglo-Spanish War, a twenty-year conflict (1585-1604). In 1601, a Spanish armada landed a contingent of troops in Ireland both to support the Irish against the English and also to drain off the English troops fighting in the Netherlands, then a part of the Spanish empire. The Spanish quickly invested the town of Kinsale and underwent a three-months long siege by English troops rushed in to quell this invasion/uprising. The Battle of Kinsale was a pivotal moment in Irish history. Here are some primary sources on this event:
Annals of the Four Masters (n.d., translated 1856, 7 vols.)
Calendar of Manuscript Material Relating to Ireland, 1580-1602 (n.d.)
Calendar of State Papers Relating To English Affairs in the Archives of Venice, Volume 9, 1592-1603.
Calendar of State Papers Relating to Ireland (especially volume 11)
Calendar of State Papers, Spain (Simancas), Volume 4, 1587-1603
Calendar of the Carew manuscripts (6 vols., 1867-73; see especially vol.4).
Calendar of the Cecil Papers (especially volumes 11 and 12).
Letter Book of Florence Mac Carthy Reagh, Tanist of Carbery, Mac Carthy Mór (1640?).
Letters from Sir Robert Cecil to Sir George Carew (1864).
Pacata Hibernia; or, A history of the wars in Ireland, during the reign of Queen Elizabeth (1633; repr., 2vols., 1820).