The English army that accompanied Edward on his march north was probably the most powerful force ever put into the field by the English in their wars with the Scots. The chroniclers said that it was a hundred thousand strong and though it may have pleased men in bygone ages to think that they vanquished such a host, the figure is ridiculous. To have supplied such a force, even if it could have been assembled, was a practical impossibility in the Britain of the 14th century. A more likely figure is somewhere in the region of 20,000. The cutting edge of the army, the seemingly invincible shock arm was the heavy cavalry. Made up of the knights, their squires and men-at-arms it was a potent weapon. The riders wore a surcoat of chain mail and this was covered with plate armour and then a flowing robe which carried the knights coat of arms for easy identification in the fight. The main weapon was a 12 ft iron-headed wooden lance. Battle-axes and maces (a kind of spiked club) were carried for close in work. the cavalry's tactics were simple: charge forward and allow the momentum of the charge to smash through and trample down any formation that stood in the way. Such formations were usually lighted armed foot-soldiers of little training for rarely did large groups of armored knights charge each other. Knight to knight encounters were usually restricted to single combat. One can imagine the terror a force of heavy cavalry at full gallop could inspire. The very earth would shake under the impact of the horses hooves and only troops of great discipline and gifted leadership could stand any chance of resisting them. Edward had 2,000 such heavy horse. 

The cavalry were supported by around 17,000 footsoldiers, spearmen and archers. The spearmen were armed with a 12ft spear and a short sword or dagger as a sidearm. They wore a quilted or leather jacket to protect them against sword slashes or arrows and wore gloves of chainmail or steel plates sewn together. On their heads they wore a bascinet, a simple steel helmet either coneshaped or with a wide brim not dissimilar to the 'battle bowlers' of World War I. The exact proportion of English archers to spearmen is not known but the latter were in the majority. The archers, who had caused such execution at the battle of Falkirk, carried a longbow made of yew and a quiver of 24 arrows, each iron-tipped and a clothyard long. When the archers came forward to loose their missiles they usually stood in line about five or six paces apart. Edward's archers came principally from Wales, but also from Ireland and the north of England.

The nature of Edward's army, with the heavy cavalry the arm that would win any martial glory, led to command problems at lower levels. As all the nobles and knights fought in the cavalry, the footsoldiers were often poorly led. In contrast the Scots nobles and knights fought amongst their men on foot and were thus well placed to maintain morale and discipline. It would be an important factor in the coming battle. One more thing hinted at a weakness or lack of will. For all the chivalric power of the English host, the great English feudal lords were conspicuous by their absence. Only Hereford and Gloucester and Pembroke rode north behind the king. It would have been different in Edward's father's day and Scotland was blessed that the old man, the 'hammer of the Scots' had passed away at Burgh-on Sands, three miles from Scotland only seven years before. This king, Scotland's bitterest ever foe, was 68 when he died and leading yet another punitive expedition north to chastise those who had been the bane of his later years. 

Among Edward's force, apart from the English, Welsh and Irish, were freebooting adventurer knights from France, Germany, Burgundy and Holland. There were also Scots, traditional enemies of the Bruce family and those who felt their own cause best advanced by service with Edward. The spirit of Scottish nationhood was nascent then and would need the impetus of a great victory to propel it to fruition. The Comyns stood with Edward, how could they do otherwise after the murder of their kinsman in Dumfries? The MacDougalls also, and the MacNabs.

The Scots who faced Edward looked very different from the glittering chivalry that filled the ranks of their enemy. No great silken banners or horses bedecked in armour and gorgeous cloths greeted the English when they finally came upon their foe. The Scots army was rugged and tough, the product of a thousand guerrilla-type engagements fought out over the length and breadth of Scotland and they had neither the time nor the need to engage in sartorial splendour. There must have been men who had stood with Wallace that stood with the Bruce that day in the summer of 1314, and not a few of their sons. Most of them had known no other life than that of the warrior and they were ready for the fight. Bruce had spent the time from the issuing of the challenge to relieve Stirling Castle to the approach of 'proud Edward's power' in training his men in the methods they must use in the upcoming battle. They were a well-drilled, disciplined, well-nigh professional army that would successfully acquit itself when the clash of spears came. 

The chroniclers said there were 20,000 of them and this figure is also ridiculous. The ratio of Scots to English was probably recorded correctly and it seems Edward had a fourfold advantage in numbers. The hard core of Bruce's army were his spearmen and of these he had 4,500 to 5,000. They were supported by a handful of archers from the Ettrick Forest and about 500 light horse. Mounted men indeed but lightly horsed they were no match for Edward's knights on their mighty armored destriers.

The Scots spearman fought with a 12 foot spear, a simple steel cap on his head, armored gloves and perhaps a leather jerkin and and chain mail shoulder cover to protect from arrows. He fought in the schilltron, or spear ring, a formation with the ability to become a fluid line in advance with more manoeuvrability than the Macedonian phalanx whose purpose it sometimes duplicated. In defence the schilltron drew in on itself into a hedgehog of prickly spears. Simple manoeuvres it seems but desperately difficult to effect on broken ground, in great haste or with men less than intimate with their task. Until the advent of the Spanish tercios almost two centuries later, there were probably no infantry in all Europe better drilled than Bruce's that midsummer. If puissant was the word to describe Edward's host, disciplined flexibility were the words most applicable to Bruce's. The army probably reflected the racial mix that had created the Scotland of the early 14th century and the blood that flowed through their veins could have been Irish, Norse, French, English or Flemish as well as Scots and Pictish. Although Gaelic speakers were in the majority there were men who spoke Lowland Scots and even some who found Norman-French the easiest on their lips.

Bruce divided his spearmen into four main divisions. Randolph, Earl of Moray commanded the the first and it contained men from Ross, Moray, Inverness, Elgin and Forres. Sir Edward Bruce, the king's last surviving brother led the men from Buchan, Mar, Angus, Strathearn, Menteith and Lennox in the second division. Walter the High Steward was the commander of the third division but as he was still a boy the real leader was Sir James Douglas. His men included the borderers and those from Lanark, Renfrew and Dumfries. The fourth division Bruce led himself and it comprised the Highlanders and Islesmen of Angus Og MacDonald and troops from Kintyre, Bute, Carrick, Cunninghame and Kyle. The horse were led by Sir Robert Keith and the baggage camp commanded by Sir John Airth. Behind Coxet Hill on the edge of the battlefield there gathered 'the small folk', townsmen, labourers, craftsmen and small tenant farmers, perhaps up to 2,000 of them. Not trained or armed well enough to be placed with the main body of troops, they could be a useful reserve if they battle started to go in the Scots favour. If it didn't they would probably be massacred by pursuing, victorious Englishmen.

For the battlefield see Bannockburn Maps