The worst book involving Ireland, ever.

Arabs decide to hold Ireland for ransom in exchange for Palestine. Libyan Arabs living in Chile pretending to be Spanish Students overrun Ireland, in conjunction with PLO, with the aid of tanks/APCs/whatever. Irish Armed Forces surrender without a fight. Eithne scuttled in harbour, one Peacock escapes to the UK. Free Irish Battalion remains in UNIFIL. Instead of simply going around the corner to Palestine and cracking heads, they also go to the UK. First act of resistance caused by an old man on a tractor who blocks the road of a Libyan convoy. (They used to do that to me all the time, I've no idea why it wasn't considered a militia act against me.) Peacock goes around acting the pirate to any Libyan cargo vessels. When one cargo vessel shoots back, is reliant on escorting British destroyer.

So, for whatever political reason, the US/UK/etc cannot take sides. They do, however, grant leaves of absence for any troops of Celtic descent (Or who dated an Irish woman once) to go be mercenaries. British SAS finds the last remaining descendant of the High Kings of Tara, and she is declared Queen of Ireland, and Commander in Chief of "Celt Force". Some equipment (Tanks, fighters, Aircraft Carrier Battle Groups) reflagged under Irish military colours for the duration.

Cue counter-invasion, general high-intensity Tom Clancy-esque combat, Mullingar gets hit by some FAEs (No loss there), and the Free Irish Battalion, filled with blood lust, take no prisoners. Irish citizens offer tea and cake to Scottish units. End with Victory parade to College Green.