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 State Papers Relating to Ireland (especially volume 11)
Calendar of the Carew manuscripts (6 vols., 1867-73; see especially vol.4).
Calendar of the Cecil Papers (especially volumes 11 and 12).
Pacata Hibernia; or, A history of the wars in Ireland, during the reign of Queen Elizabeth (1633; repr., 2vols., 1820).