Kinsale: The Battle which ended the Nine Years War in favour of the English crown.
How do you see the future playing out if The O'Neill had convinced the other Irish Clans to dig in and await the starvation of the English army at Kinsale instead of attacking and losing?
The English army destroyed, the English presence in Ireland reduced to The Pale, and even this is under immediate threat.
The O'Neill crowned (High) King of Ireland, after the victory at Kinsale can convince more clans to join.
Even closer ties with Spain which bolsters forces already landed earlier at Kinsale.
The English crown removed from Ireland, with its eviction from The Pale.
What happens to Protestant England when a free Catholic Ireland emerges to its west? An Ireland which is a close ally of Spain?