The slaying of John Comyn was a decisive act in Scottish political history. Soon after this Bruce had been crowned with the full support of the Scottish Church, which effectively set aside a papal interdict, although he still faced some formidable obstacles. The balance of power in Scotland shifted firmly in favour of the English. The chief weakness of the campaigns of
Edward I of England, virtually from the outset, was that he was unable to build a lasting alliance with the Scottish nobility, a traditional power base on which his rule depended: friends at one moment were liable to be enemies at the next. With the murder of John Comyn, his extensive network of family and kinsmen, long in the forefront of the national struggle, were guaranteed to fight on the side of the English against Robert Bruce, whom they now considered to be the greater evil. Bruce's Scottish enemies controlled large and strategically important lands throughout the realm, in
Galloway,
Lochaber,
Atholl,
Ross,
Buchan, and
Badenoch and
Strathspey. Much of Argyll was under the control of
Alexander MacDougall, the Lord of Lorne, who had been related to John Comyn by marriage. Soon after Bruce was defeated by the English at the
Battle of Methven, what was left of his army was mauled by Alexander's son, John of Lorne, also known as Iain 'Bacach'-'the Lame'-at the
Battle of Dalrigh near
Tyndrum. Bruce, who narrowly escaped capture, took to hiding. Although the king made a remarkable recovery from these disasters, descending on
Ayrshire in the spring of 1307 to begin a guerrilla war, it was by no means certain in these early days that he would be able to prevail against the combination of English military power and internal resistance. Soon after his Ayrshire campaign began he was favoured by a major stroke of good fortune: Edward I, on his way north with an army, died just short of the Scottish border in July 1307. His son, the far less capable
Edward II, turned his attention towards English domestic politics, leaving his Scottish allies to manage as best they could. Bruce, who was convinced that the English were bound to return in the summer of 1308, decided to act with speed and thoroughness. ==Harrowing the North==