Methven
In Scotland, Robert Bruce was already engaged in a full-scale civil war with the family and friends of John Comyn. The coronation in March had given him some legitimacy; but overall the position was very uncertain. Even his wife, Elizabeth de Burgh, the daughter of the Earl of Ulster, and now queen of Scots, was concerned. After the coronation she is reported to have said 'It seems to me we are but a summer king and queen whom children crown in their support'.
Valence moved quickly, and by the middle of summer he had made his base at Perth, where he was joined by many of the supporters of John Comyn. King Robert came from the west, ready to meet his foe in battle. He was prepared to observe on this occasion the gentlemanly conventions of feudal warfare, while the English adopted less orthodox tactics. Valence was invited to leave the walls of Perth and join Bruce in battle, but he declined. The king, perhaps believing that Valence's refusal to accept his challenge was a sign of weakness, retired only a few miles to nearby Methven, where he made camp for the night. Before dawn on 19 June, his little army was taken by surprise and almost destroyed, because Bruce had accepted Valence at his word and failed to take the precaution of placing pickets around the camp. His entire army was routed.
After this experience, he borrowed a page from the book of William Wallace and switched to the guerrilla warfare which the latter had usually preferred.
Read more about this topic: Battle Of Methven