The Scots pressed hard, but were beaten off by English longbowmen and some supporting infantry even before Balliol's men-at-arms could get ashore.
The invaders fought the main Scottish army five days later at the Battle of Dupplin Moor and inflicted a crushing defeat.
This disastrous campaign brought Edward's regents, Isabella of France and Roger Mortimer, to the negotiating table.
They agreed to the Treaty of Northampton with Robert the Bruce (r. 1306–1329) in 1328 but this was widely resented in England and commonly known as turpis pax, "the shameful peace".
In 1331, under the leadership of Edward Balliol and Henry Beaumont, Earl of Buchan, the disinherited Scottish nobles gathered in Yorkshire and plotted an invasion of Scotland.
Knowing Mar to be commanding the troops on the northern shore of the firth, Balliol landed there, at Wester Kinghorn (present day Burntisland),[8] on 6 August 1332.
Buoyed by this victory, Balliol and Beaumont's force completed their disembarkation and marched to Dunfermline, where they looted a Scottish armoury.
[16] On 11 August Balliol's force met Mar's army at the Battle of Dupplin Moor,[9] where the Scots vastly outnumbered the invaders; by ten to one according to an estimate by Rogers.
[21][22] Edward supported him, inflicted a defeat on the Scots at the Battle of Halidon Hill in July 1333 and put Balliol back on the Scottish throne.