The failed siege halted the high king's bid to expel Anglo-Normans from Dublin, consolidating Norman control of Ireland's most strategic city.
Key Facts
- Year
- 1171
- Irish besieging force
- 60,000 men
- Irish casualties (Norman sally)
- 1,500 killed
- Siege outcome
- Unsuccessful; Irish forces routed
- Norman commander
- Strongbow
- Irish commander
- Ruaidrí Ua Conchobair, High King of Ireland
By the Numbers
Location
Cause → Event → Consequence
Following the Anglo-Norman seizure of Dublin, the last high king of Ireland, Ruaidrí Ua Conchobair, sought to reclaim the city. He assembled a large coalition force of roughly sixty thousand men, determined to drive out the invaders and reassert native Irish authority over the kingdom's most important urban centre.
Ua Conchobair divided his army into four encampments surrounding Dublin. Exploiting this dispersal, the Norman garrison commander Strongbow launched a night surprise attack directly against the high king's camp. The sudden assault killed approximately fifteen hundred Irish soldiers and caused the remainder of the besieging force to break and flee, ending the siege.
The failure of the siege effectively secured Anglo-Norman dominance over Dublin and undermined the high king's authority. Strongbow, who had already repulsed an earlier Irish attempt on the city, consolidated his position. The defeat left the native Irish unable to dislodge the Normans from Dublin, accelerating the broader Norman establishment in Ireland.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Strongbow.
Side B
1 belligerent
Ruaidrí Ua Conchobair.