Tara, Rath of the Synods
Claureen, Co. Offaly
Glenbrohane Graveyard

The Book of Lismore, containing the written record of the story of "The Siege of Knocklong", was composed around 1480.
It was discovered hidden in the walls of Lismore Castle, Co. Waterford in 1814.

Approximately in the year 250 ADE, midway through his reign as High King of Ireland, Cormac Mac Airt leads his army into Munster to collect extra taxes and tributes.
Cormac is warned by his Druids that his claims are unjust and that his army will be slaughtered. He ignores all advice.

The Siege of Knocklong describes the journey of Cormac and his army southwards. They travel 5 days and 5 nights, arriving on the Hill of Knocklong on the sixth morning of travel. They lose a week enroute due to Druid mischief.

Cormac sets up his camp at Droim Dámhgháire (Knocklong) and Fiacha sets up at Ceann Chláire (Glenbrohane).

Fiacha Moilleathan, King of Munster, and the Munstermen resist Cormac's claims.

The siege lasts over a year and includes five battles between the opposing armies. When th
e battles fail to bring the Munstermen to submission, Cormac's druids dry up all sources of water in the area, and the siege begins.
This act nearly drove the Munstermen to death. Fiacha turned to the powerful Munster druid Mug Ruith for aid. He restored the water. The Munste
rmen regain their strength and with Mogh Ruith's help, they defeat
Cormac and drive his army out of Munster.

Fiachu and the Munstermen defeat Cormac and his Northern army at Knocklong.

The Decision to invade Munster

The Journey from Tara to Clonard

Camp 1 Monday
The first night the army made camp at Clonard. (Comar na gCuan/Comar Cluana hIoraird)

The Journey from Clonard to Claureen to Ath and tSlua/Ath na nIarlann

Camp 2 Tuesday
The next day the army continued the march southwards. They headed towards Kilmaine(Co.Offaly, Claureen between Birr and Kinnity (Coill Mhéain) and reached Ath and tSlua/Ath na nIarlann. Here they set up camp for the night.

The Journey from Claureen to the Slopes of Slieve Felim

Camp 3 Wednesday
The summit of the slope of Formhaol. The army crossed the stream, proceeded past Dubhchoill which is known as Fiodh Damhaiche. From this to Má Leathaird now called Má Tuaiscirt, then on to Crunn-Mhá which is now known as Má Ghabhra, then to Má nUachtair known now as Má Roighne. They made their way into Bocaí Báinfhliucha now called Slievefelim (Sliabh Eibhinne) mountains. They set up camp on the summit of the slope of Fermoyle(above Durrow?. Another Fermoyle close to Kildare town)) (Formhaol na bhFiann) that night.  Céacht proceeded westwards to Dubhghleann which is called Gleann Salach [Glansallagh in Co. Cork] today, to meet the druid Art

The Journey from Slieve Felim to Ath Cúile Feá /Ath Croí

Camp 4 Thursday
After that they set out again and reached Ath Cúile Feá /Ath Croí that night. Ceathach went to meet the druid Dubhfhois Mac  Dofhis at Cúil Fheá Formáile –( Fermoyle Co. Laois? )

The Journey from Ath Cúile Feá to Emly

Camp 5 Friday
They continued their march and set up camp that night in Emly (Druim Meáin Mairtine / Ardchluain na Féne / Mucfhalach Mac Dáire Ceirbe)

Setting up camp on Knocklong Hill

Camp 6 Saturday
Cormac's army arrive at Knocklong Hill/ Cnoc na gCeann / Droim Dámhgháire

The Battles at the Ford
The Siege Begins. The lakes and rivers are dried up
Return Journey to Sliabh Fuait
Fiachra's residence at Knockgraffon