29 November 1641: Battle of Julianstown/ Baile Iúiliáin in County Meath was fought on this day. Julianstown is situated on the River Nanny, which flows into the sea at Laytown about 3 km away. It was along this way that a relief force from Dublin was dispatched by the Lords Justice Borlase and Parsons to help relieve the town of Drogheda, which was in danger of encirclement by the Irish insurgents of Sir Phelim O’Neill. 

He directed a force led by Colonel Rory O'More / Ruairí Óg Ó Mórdha to prevent this column from ever reaching Drogheda and O’More kept close to the main road north from Dublin to enable him to strike at a moment of his own choosing. The Irish troops actually engaged though were under the tactical command of one Colonel Plunkett on the day apparently. As luck would have it the weather this day was cold and foggy and the English, even though warned beforehand by Viscount Gormanstown that they were in immediate danger, stumbled into what was in effect an ambush. The Irish waited until the moment was ripe and then they uttered a great shout of their war cries and rushed out of the mists to fall upon the hapless enemy cutting them to pieces. Some 600 of the enemy were left dead on the road and surrounding fields while the few survivors fled back in the direction they came. 

...the rebels forces who now furiously approached with a great shout and a lieutenant giving out the unhappy word of counter march all the men possessed as it were of a panic fear began somewhat confusedly to march back; but they were so much amazed with a second shout given by the rebels, who, seeing them in disorder followed close on, as not withstanding that they had gotten into a ground of great advantage, they could not be persuaded to stand a charge, but betook themselves to their heels, and so the rebels fell sharply on, as their manner is, upon the execution.

Bellings in Gilbert’s Irish Confederation

Prisoners were taken but according to Temple the attackers ‘spared very few or none that fell into their hands, but such as were Irish whose lives they preserved’

Sir John Temple The Irish Rebellion (London, 1646) 

The commander of the Royalist force was Sir Patrick Wemyss, Scottish born but his mother was related to the Earls of Desmond. He was Captain-Lieutenant in the Army of King Charles I and was a close associate of the Earl of Ormond. He has left us the only known eye witness account of the battle. He wrote to Ormond on the following day:

I will now tell you of our misfortune. We lodged last night at Balrederie (Balrothery,), as my officers could not make the men march to Drogheda. We were informed that the enemy were upon us, but they did not fall on us. Next day on the march, we sent out scouts and saw a few rebels, but after crossing the Julanstowne bridge, I saw them advancing towards us in as good order as ever I saw any men. I viewed them all, and to my conjecture they were not less than 3,000 men....

I drew up the troops on their front, and told the captains that we were engaged in honour to charge them, and that I would charge them first with those horse I had. They promised faithfully to second me. But when I made the trumpet sound, the rebels advanced towards us in five great bodies of foot; the horse, being on both wings, a little advance before the foot; but just as I was going to charge, the troop cried unto me and told me the foot had left their officers, thrown down their arms, and took themselves to running. It was useless to fight, so I withdrew as best I could and escaped with a loyal remnant to Drogheda.

Two of my troop whose horses went lame were left behind. I hear however that they are safe, except for their clothes, which were taken from them, not by the rebels, but by natives as they passed through the village. All our arms and ammunition are in the rebel's hands. We can get no food here for man or horse.

Calendar of State Papers Ireland 1641

The defeat of the troops sent from Dublin was a powerful factor in influencing the Catholic Old English of Meath to throw in their lot with their fellow co religionists to halt any further encroachments upon their Civil and Religious Liberties by the English Protestants. This was a real catalyst in the history of Ireland as it was the first time that the people descended from the English colonisers of the 12/13th centuries had come together in a common cause with the native Gaelic Irish.