Wallace's plan of battle was that the Scottish squares should first receive the brunt of the onslaught of the enemy, and that while the English were endeavouring to break these the Scotch cavalry, which were drawn up some distance in the rear, should fall upon them when in a confused mass, and drive them against the fence or into the morass.

The first division of the English on arriving at the bog made a circuit to the west. The second division, seeing the obstacle which the first had encountered, moved round to the east, and both fell upon the Scottish squares. The instant they were seen rounding the ends of the morass, the traitor Comyn, with the whole of the cavalry, turned rein and fled from the field, leaving the infantry alone to support the whole brunt of the attack of the English. So impetuous was the charge of the latter that Sir John Stewart and his archers were unable to gain the shelter of the squares, and he was, with almost all his men, slain by the English men-at-arms. Thus the spearmen were left entirely to their own resources.

Encouraged by Wallace, Grahame, Archie Forbes, and their other leaders, the Scottish squares stood firmly, and the English cavalry in vain strove to break the hedge of spears. Again and again the bravest of the chivalry of England tried to hew a way through. The Scots stood firm and undismayed, and had the battle lain between them and the English cavalry, the day would have been theirs. But presently the king, with his enormous body of infantry, arrived on the ground, and the English archers and slingers poured clouds of missiles into the ranks of the Scots; while the English spearmen, picking up the great stones with which the ground was strewn, hurled them at the front ranks of their foes. Against this storm of missiles the Scottish squares could do nothing. Such armour as they had was useless against the English clothyard arrows, and thousands fell as they stood.

Again and again they closed up the gaps in their ranks, but at last they could no longer withstand the hail of arrows and stones, to which they could offer no return. Some of them wavered. The gaps in the squares were no longer filled up, and the English cavalry, who had been waiting for their opportunity, charged into the midst of them. No longer was there any thought of resistance. The Scots fled in all directions. Numbers were drowned by trying to swim the river Carron, which ran close by. Multitudes were cut down by the host of English cavalry.

Sir Archie Forbes was in the same square with Wallace, with a few other mounted men. They dashed forward against the English as they broke through the ranks of the spearmen, but the force opposed them was overwhelming.

"It is of no use, Archie; we must retire. Better that than throw away our lives uselessly. All is lost now."

Wallace shouted to the spearmen, who gallantly rallied round him, and, keeping together in spite of the efforts of the English cavalry, succeeded in withdrawing from the field. The other squares were entirely broken and dispersed, and scarce a man of them escaped.

Accounts vary as to the amount of the slaughter, some English writers placing it as double that of the army which Wallace could possibly have brought into the field, seeing that the whole of the great nobles stood aloof, and that Grahame, Stewart, and Macduff of Fife were the only three men of noble family with him. All these were slain, together with some 25,000 infantry.

Wallace with about 5000 men succeeded in crossing a ford of the Carron, and the English spread themselves over the country. The districts of Fife, Clackmannan, Lanark, Ayr, and all the surrounding country were wasted and burnt, and every man found put to the sword. The Scotch themselves in retreating destroyed Stirling and Perth, and the English found the town of St. Andrew's deserted, and burnt it to the ground.

No sooner had Wallace retreated than he divided his force into small bands, which proceeded in separate directions, driving off the cattle and destroying all stores of grain, so that in a fortnight after the battle of Falkirk the English army were again brought to a stand by shortness of provisions, and were compelled to fall back again with all speed to the mouth of the Forth, there to obtain provisions from their ships. As they did so Wallace reunited his bands, and pressed hard upon them. At Linlithgow he fell upon their rear and inflicted heavy loss, and so hotly did he press them that the great army was obliged to retreat rapidly across the Border, and made no halt until it reached the fortress of Carlisle.