After the failure of the Spanish Armada in 1588 Philip II decided to offer Spanish aid to the Irish Lords who were rebelling against English Rule. By helping the Irish rebels he hoped create a new front for the war against England and to direct away more of English resources.
For years Spain sent material support towards the rebels and after his death Philip III continued in the same vein. He sent Don Juan del Águila and Don Diego Brochero with 6000 men and loaded with arms and ammunition. On from Lisbon to Ireland.
Bad weather cause the ships to separated and some had to turn back. A month later on the 2nd of October Don Juan del Águila and 4000 of his men landed at Kinsale.
This was the start of the siege of Kinsale the decisive turning point of the Nine Year’s War.