Edward's chosen target was Berwick: a Scottish town on the
Anglo-Scottish border, astride the main invasion and trade route in either direction. According to a
contemporary chronicle, Berwick was "so populous and of such trade that it might justly be called another
Alexandria, whose riches were the sea and the waters its walls". It was the most successful trading town in Scotland, and the duty on wool which passed through it was the Scottish Crown's largest single source of income. In the Middle Ages, it was the gateway from Scotland to the English eastern
march. Edward hoped the possibility of losing it would draw the Scots into a
set-piece battle, which he anticipated winning. During centuries of war between the two nations battles had been rare, as the Scots preferred
guerrilla tactics and border raiding into England. Berwick was one of the few targets which might bring the Scots to battle as, in the words of the historian
Clifford Rogers, "abandoning it was almost unthinkable". Weapons and supplies were gathered as the Scots made arrangements for the defence of Berwick. The town walls stretched for and were up to thick and high. They were protected by towers, each up to tall.
Berwick Castle was to the west of the town, separated by a broad moat, making the town and castle independent strongholds. Berwick was well-defended, well-stocked with provisions and
materiel, and expected to be able to withstand a long siege.
Berwick under siege Balliol, in command of the disinherited Scottish lords and some English magnates, crossed the border on 10 March 1333. He marched through
Roxburghshire, burning and
pillaging as he went. He reached Berwick in late March and cut it off by land. Edward's navy had already isolated it by sea. Balliol and the nobles accompanying him are said to have sworn not to withdraw until Berwick had fallen. Edward arrived at Berwick with the main English army on 9May, after leaving
Queen Philippa at
Bamburgh Castle, south of Berwick. Balliol had been at Berwick for six weeks and had placed the town under close siege. Trenches had been dug, four underground pipes supplying water to the town were cut and all communication with the hinterland prevented. A
scorched-earth policy was applied to the surrounding area to deny supplies for the town if an opportunity to break the siege occurred. This pillaging of the countryside also added to the English army's supplies. The besieging army included troops raised in the
Welsh Marches and
the Midlands, as well as levies from the north which had already mustered on account of the earlier Scottish raids. By the end of the month, this force had been augmented by noble retinues, a muster at
Newcastle, and the assembly of the English fleet in the
River Tyne. Accompanying the army were craftsmen to build
siege engines. Edward had arranged for the combined army to be supplied by sea through the small port of
Tweedmouth. Sir
Archibald Douglas was Guardian of the Realm for the underage David and he assembled an army north of the border. The
chronicles of the time variously claim they numbered 14,629, 30,000, 40,000, 80,000, 90,000, more than 100,000 or that they outnumbered the English five to one. Rogers believes that around 15,000 is plausible. A high proportion were mounted, but nearly all of them would dismount when fighting was expected. The Scots launched minor raids into
Cumberland, which achieved little. Douglas assembled ever more troops, rather than using those he already had to attempt to draw the English away from Berwick. This inactivity contrasts with Robert Bruce's swift response to the English siege of Berwick in 1319. Edward exploited the Cumberland raids to claim that his invasion was a response to them. By the end of June attacks by land and sea had brought Berwick to a state of ruin and the garrison close to exhaustion. It is believed that a desire for a respite from the
plunging fire of the two large counterweight
trebuchets used by the English was a significant factor in causing the town's governor,
Sir Alexander Seton, to request a short truce from Edward. This was granted, but only on the condition that he surrender if not relieved by 11 July. Seton's son, Thomas, was to be a hostage to the agreement, along with eleven others.
Relief force Douglas was now faced with a choice of abandoning Berwick to fall to the English or attempting to go to its relief and risking a
pitched battle. The modern historian Ranald Nicholson considers "If Berwick were to be saved immediate action on the part of the Scottish guardian was unavoidable". The army Douglas had spent so much time gathering was now compelled to take to the field. Douglas entered England on 11July, the last day of Seton's truce. He advanced eastwards to Tweedmouth and destroyed it in sight of the English army. Edward did not move. On the afternoon of 12 July
Sir William Keith, with Sir Alexander Gray and
Sir William Prenderguest, led a force of around 200 Scottish cavalry towards Berwick. With some difficulty, they forced their way across the ruins of a bridge over the Tweed to the north bank and made their way into the town. Douglas considered the town relieved. On 13 July he sent messages to Edward calling on him to depart, threatening that if he failed to do so, the Scots army would devastate England. Edward ignored them. The defenders argued that Keith's 200 horsemen constituted a relief according to the truce and therefore they did not have to surrender. Edward stated this was not the case: they had to be relieved directly from Scotlandliterally from the direction of Scotlandwhereas Keith, Gray and Prenderguest had approached Berwick from the direction of England. Edward ruled that the truce agreement had been breached – the town having neither surrendered nor been relieved. A gallows was constructed in sight of the town walls and, as the highest-ranking hostage, Thomas Seton was hanged while his parents watched. Edward issued instructions that each day the town failed to surrender, another two hostages should be hanged. Keith took over command of the town from Seton and concluded a fresh truce on 15 July, promising to surrender if not relieved by sunset on 19July. The truce comprised two
indentures, one between Edward and the town of Berwick and the other between Edward and
Patrick Dunbar, Earl of March, the Keeper of Berwick Castle. It defined circumstances in which relief would or would not be considered to have occurred. The terms of surrender were not
unconditional. The town was to be returned to English soil and law but the inhabitants were to be allowed to leave, with their goods and chattels, under a
safe conduct from Edward. All members of the garrison would also be given free passage. Relief was defined as one of three events: 200 Scottish men-at-arms fighting their way into Berwick; the Scottish army forcing its way across a specific stretch of the River Tweed; or, defeat of the English army in open battle on Scottish soil. The garrison was also permitted to
sortie to assist any relief attempt by the main Scottish army. On concluding the new treaty, Keith was allowed to immediately leave Berwick, travel to wherever the Guardian of Scotland happened to be, advise him of the terms of the treaty, and return safely to Berwick. By this time Douglas had marched south to Bamburgh, where Edward's queen Philippa was still staying, and besieged it; Douglas hoped this would cause Edward to break off his siege. In 1319 Edward's father, Edward II, had broken off a siege of Berwick after a Scottish army had advanced on York, where his queen was staying, and devastated Yorkshire. Edward ignored the threat to Bamburgh as the Scots did not have the time to construct the kind of equipment that would be necessary to take the fortress by assault. They devastated the countryside but Edward ignored this too. He positioned the English army on
Halidon Hill, a small rise of some , to the north-west of Berwick, which gives an excellent view of the town and the vicinity. From this vantage point, he dominated the crossing of the Tweed specified in the indentures and would have been able to attack the flank of any force of men-at-arms attempting to enter Berwick. A contemporary account estimates the size of the English army at 10,000 men, although Rogers suggests desertion and the expiry of terms of service would have reduced it to significantly fewer and that it is possible the English were outnumbered two to one. Edward detached 700 men-at-arms and an unknown number of archers and infantry to guard against a sortie by the Berwick garrison. Receiving Keith's news, Douglas felt his only option was to engage the English in battle. == Battle ==