List of brigades of the Irish Republican Army

Munster

County Clare

Period	Brigade	Division	Commandant
1916–1917	East Clare Brigade		Michael Brennan
1916–1917	Mid Clare Brigade		Sean McNamara
1916–1917	North Clare Brigade		H. J. Hunt
1916–1917	West Clare Brigade		E. Fennell
1917–1918	Clare Brigade		Patrick Brennan
1918–1922	East Clare Brigade	1st Western	Michael Brennan
1918–1922	Mid Clare Brigade	1st Western	Frank Barrett
1918–1922	West Clare Brigade	1st Western	Art O'Donnell

Ulster

County Antrim

Period	Brigade	Division	Commandant
1916–1922	Belfast Brigade	3rd Northern	Sean Cusack & Joe McKelvey

County Cavan

Period	Brigade	Division	Commandant
1916–1921	Cavan Brigade
1921–1922	East Cavan Brigade	5th Northern	Peadar McMahon, Sean Gallagher & Seumus McGoran
1921–1922	West Cavan Brigade	Midland	Pat Woods

County Donegal

Period	Brigade	Division	Commandant
–1922	West Donegal Brigade	1st Northern
–1922	North East Donegal Brigade	1st Northern
–1922	South West Donegal Brigade	1st Northern
–1922	South East Donegal Brigade	1st Northern

County Monaghan

Period	Brigade	Division	Commandant
1916–1922	Monaghan Brigade	5th Northern	Eoin O'Duffy

Connacht

County Galway

Period	Brigade	Division	Commandant
1916–1920	Galway Brigade
1920–1922	South East Galway Brigade	1st Western
1920–1922	North Galway Brigade	2nd Western
1920–1922	West Galway Brigade	4th Western	Peter Joe McDonnell

External links

• Bureau of Military History, 1913-1921 at Defence Forces
• Order of Battle of the Irish Republican Army, June 1922 by Paul V. Walsh