Achaidh Leithdeircc

Battle of Achadh Leith-dheirg
	; Battle site 331AD of the Three Collas & the Ulaid. Site of battle disputed between the three locations marked.
Date	331
Location	Fearn-mhagh
Result	Three Collas victory
Belligerents
The Ulaid	The Three Collas
Commanders and leaders
King Fearghus Fogha	Colla Meann, Colla Uais, Colla Da Crioch
	Battle site disputed between: Aghaderg parish - Barony of Dartree - Barony of Farney.

Achaidh Leithdeircc (modern spelling Achadh Leith-dheirg) is an ancient location in Ireland reputed to be the site of a historic battle, or series of battles, around the year 331AD, in which the forces of the Three Collas along with men of Connaught eventually conquered vast tracts of territory from the tribes of the Ulaid. The prehistoric royal site of Navan Fort was burnt and plundered and ultimately this territory would re-emerge as part of the kingdom or federation of Airgíalla.

The Battle of Achadh Leith-dheirg was fought in the territory of "Fearnmhagh", according to 19th-century Celtic scholar John O'Donovan. The place of the battle has been disputed between Fearn-mhagh, County Monaghan and Aghaderg, near Loughbrickland, County Down.

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