It had been arranged that Archie should operate independently of Douglas, the two joining their forces only when threatened by overwhelming numbers or when any great enterprise was to be undertaken. Archie took with him a hundred and fifty men from his estates in Lanark and Ayr. He marched first to Loudon Hill, then down through Cumnock and the border of Carrick into Galloway. Contrary to the usual custom, he enjoined his retainers on no account to burn or harry the villages and granges.
"The people," he said, "are not responsible for the conduct of their lords, and as I would not see the English harrying the country round Aberfilly, so I am loath to carry fire and sword among these poor people. We have come hither to punish their lords and to capture their castles. If the country people oppose us we must needs fight them; but beyond what is necessary for our provisions let us take nothing from them, and show them, by our conduct, that we hold them to be Scotchmen like ourselves, and that we pity rather than blame them, inasmuch as by the orders of their lords they are forced to fight against us."
Archie had not advanced more than a day's march into Galloway when he heard that Sir John de St. John was marching with four hundred men-at-arms to meet him.
There were no better soldiers in the following of Bruce than the retainers of Aberfilly and Glen Cairn. They had now for many years been frequently under arms, and were thoroughly trained to fight together. They had the greatest confidence in themselves and their leader, and having often with their spears withstood the shock of the English chivalry, Archie knew that he could rely upon them to the fullest. He therefore took up a position on the banks of a river where a ford would enable the enemy to cross. Had he been less confident as to the result he would have defended the ford, which could be only crossed by two horsemen abreast. He determined, however, to repeat the maneuver which had proved so successful at Stirling Bridge, and to let half of the enemy cross before he fell upon them.
The ground near the river was stony and rough. Great boulders, which had rolled from the hillside, were thickly scattered about it, and it would be difficult for cavalry to charge up the somewhat steeply sloping ground in anything like unbroken order.
With eighty of his men Archie took up a position one hundred yards back from the stream. With great exertions some of the smaller boulders were removed, and rocks and stones were piled to make a wall on either flank of the ground, which, standing two deep, he occupied. The remaining seventy men he divided equally, placing one company under the command of each of his two faithful lieutenants, Andrew Macpherson and William Orr. These took post near the river, one on each side of the ford, and at a distance of about one hundred yards therefrom. Orr's company were hidden among some bushes growing by the river. Macpherson's lay down among the stones and boulders, and were scarce likely to attract the attention of the English, which would naturally be fixed upon the little body drawn up to oppose them in front. The preparations were scarcely completed when the English were seen approaching. They made no halt at the river, but at once commenced crossing at the ford, confident in their power to overwhelm the little body of Scots, whose number had, it seemed to them, been exaggerated by the fears of the country people. As soon as a hundred of the men-at-arms had passed, their leader marshalled them in line, and with level spears charged up the slopes against Archie's force. The great boulders broke their ranks, and it was but in straggling order that they reached the narrow line of Scottish spears. These they in vain endeavoured to break through. Their numbers were of no avail to them, as, being on horseback, but twenty men at a time could attack the double row of spearmen. While the conflict was at its height Archie's trumpet was sounded, for he saw that another hundred men had now crossed the ford.
At the signal the two hidden parties leapt to their feet, and with levelled pikes rushed towards the ford. The English had no force there to resist the attack, for as the men-at-arms had passed, each had ridden on to join the fray in front. The head of the ford was therefore seized with but little difficulty. Orr, with twenty men, remained here to hold it and prevent others from crossing, while Macpherson, with fifty, ran up the hill and fell upon the rear of the confused masses of cavalry, who were striving in vain to break the lines of Archie's spears.
The attack was decisive; the English, surprised and confused by the sudden attack, were unable to offer any effectual resistance to Macpherson's pikemen, and at the same moment that these fell upon the rear, Archie gave the word and his men rushed forward upon the struggling mass of cavalry. The shock was irresistible; men and horses fell in numbers under the Scottish spears, and in a few minutes those who could manage to extricate themselves from the struggling mass rode off in various directions. These, however, were few in number, for ninety were killed and seventy taken prisoners. St. John himself succeeded in cutting his way through the spearmen, and, swimming the river below the ford, rejoined his followers, who had in vain endeavoured to force the passage of the ford. With these he rapidly retired.
A detachment of fifty men were sent off with the prisoners to Bruce, and Archie, with the main body of his followers, two days later joined the force under Sir James Douglas.
Upon the following morning a messenger from Aberfilly reached Archie.