There is very little news of the Scots navy in those days, but it seems to have been reasonably active. On September 12, one bold mariner, Thomas Dunn, 'with a great navy of Scots,' followed an English ship into Holyhead harbour, and, in the absence of the master on shore, carried it off to Scotland. About the same time John of Argyll was in Dublin, impatiently expecting reinforcements from the Cinque Ports. Edward retained part of the squadron to assist the French king against the Flemings.

On January 15, 1315–16, Bruce and Douglas made a sudden attack on Berwick, by land and sea simultaneously, during the night. They hoped to effect an entrance from the sea, at a point between the Brighouse and the castle, where there was no wall. The attempt failed. It was bright moonlight, and the assailants were promptly observed and repulsed. Sir John de Landells was slain, and Douglas himself escaped with difficulty in a small boat.

The garrison of Berwick had only too much reason to complain. Writing on October 3, Edward's Chamberlain of Scotland had informed him that the provisions expected from Boston in the end of July had never been sent, and 'the town is in great straits, and many are dying from hunger.' Indeed, 'if the Mayor and himself had not promised the garrison food and clothing for the winter, they would have gone.' Two days later, Sir Maurice de Berkeley, the warden, wrote that the town and the inhabitants never were in such distress, 'and will be this winter, if God and the King don't think more of them,' and quickly. Unless money and provisions arrive by the end of the month, they will give up their posts and leave the town, to a man. On October 30, indeed, a vessel had brought in malt, barley and beans, but the master had had to throw overboard a great part of his cargo to escape the enemy. On November 26, Edward sent £300 by way of pay to the garrison; but he could not succour them effectually, and apparently Valence, who was warden north of Trent, had fallen into a lethargy. The repulse of Bruce was therefore signally creditable to the defence.

A series of four official despatches during the latter half of February and the first week in March exhibit the deplorable state of the town from famine. On February 14, part of the garrison, in the teeth of the warden's orders, had gone out on a foray, declaring it was better to die fighting than to starve. They had captured many prisoners and cattle, but Douglas, on the information of Sir Adam de Gordon, who had recently changed sides, caught them at Scaithmoor, slew their leader, and furiously broke up their schiltron, killing or capturing twenty men-at-arms and sixty foot. Considering that the men were struggling to keep the means of rescuing them from starvation, Barbour may well be right in declaring it to be the hardest fight that Douglas ever fought. The foray brought no relief to the garrison, except by diminution of mouths. The men were 'dying of hunger in rows on the walls.' 'Whenever a horse dies,' wrote Sir Maurice de Berkeley, 'the men-at-arms carry off the flesh and boil and eat it, not letting the foot soldiers touch it till they have had what they will. Pity to see Christians leading such a life.' He will remain warden no longer than his term, which expires a month after Easter.

Meantime Sir Henry de Beaumont, warden of the March, had gone to Lincoln to represent to the King and Council his conferences with some of the Scots leaders for a truce. On February 22, Edward appointed commissioners to treat with Bruce, Sir Maurice de Berkeley being one; and on April 28, 1316, he authorised safe conducts for the Scots envoys. But the business did not get forward, and the Mayor of Berwick, on May 10, sent urgent news to the King. Berwick has provisions for a month only; the enemy's cruisers have cut off supplies, and have just captured two vessels with victuals; the warden will serve an extended term till Whitsunday, but no longer; Bruce will be at Melrose in a fortnight with all his force. And all the time Edward was hampered in his measures against Scotland by the war in Ireland and by a rising in Wales.

At midsummer 1316, the Scots again crossed the Border with fire and sword, and penetrated to Richmond, where they were heavily paid to abstain from further burning in the town and neighbourhood. Then they headed west as far as Furness, burning and ravaging without opposition. They carried home immense booty, as well as many prisoners, men and women; and they were particularly delighted with the quantity of iron they found at Furness, there being very little iron in Scotland. The leader of this expedition is not named.

For many years there had been great scarcity in both countries, a natural consequence of predatory warfare. 'This year,' says the Lanercost chronicler, 'there was both in England and in Scotland a mortality of men from famine and pestilence unheard of in our times; and in the northern parts of England a quarter of corn sold at 40s.' Walsingham says the distress was worst in the north, where, he heard, 'the people ate dogs and horses and other unclean animals.'

In Ireland it was still worse; in these wretched years of intestine broils, it is said 'men were wont to devour one another.' Sir Edward Bruce had now been fighting there for a full year. With his Irish allies, he had raided the English adherents in Ulster; occupied Carrickfergus after a great fight, but failed to take the castle; captured and burnt Dundalk (June 29, 1315); defeated the joint forces of the Earl of Ulster and the King of Connaught at Connor (September 10); besieged Carrickfergus in vain (till December 6); marched down into Kildare, defeating first Sir Roger de Mortimer at Kenlis, and afterwards (January 26) Sir Edmund le Butler, the justiciar, at Arscott; and returned to the siege of Carrickfergus, which was starved into surrender some time in summer. On May 2, 1316, Sir Edward was crowned King of Ireland.

In autumn of 1315, and again in the following March, Randolph had returned to Scotland for reinforcements. On the latter occasion he brought Sir Edward's urgent request that King Robert would come in person, for then the conquest would be assured. In autumn, 1316, accordingly, Bruce appointed Douglas and the Steward Guardians in his absence, and sailed from Loch Ryan to Carrickfergus. His operations during the winter in Ulster do not appear to have advanced the cause materially, and in spring he set out on an adventurous expedition throughout Ireland.

Barbour's account, though considerably detailed, can be treated only with the greatest reserve. King Edward led the van, King Robert brought up the rear. The enemy lay in wait at Moyra Pass, 'the Gap of the North,' the immemorial route of invaders north and south, some three miles north of Dundalk. Edward, says Barbour, rode past the ambush. When the rear came up, two archers appeared in view, immediately suggesting the nearness of an enemy; and Bruce held back his men. Sir Colin Campbell, son of Sir Nigel and nephew of Bruce, pressed forward and killed one of them, but the other shot his horse; whereupon Bruce, in great wrath, felled Sir Colin with his truncheon for disobedience, which 'might be cause of discomfiting.' Emerging at length from the gorge, they found Richard de Clare with 40,000 men drawn up on the plain, whom they presently defeated: in all the Irish war 'so hard a fighting was not seen.' When Edward heard of it, 'might no man see a wrother man.' But only a cloistered ecclesiastic can be held responsible for such military procedure.