Battle of Bannockburn for the night. Sir Alexander Seton, a Scottish noble serving in Edward's army, defected to the Scottish side and informed them of the English camp's position and low morale. Robert Bruce decided to launch a full-scale attack on the English forces and to use his schiltrons again as offensive units, a strategy his predecessor William Wallace had not done. The English army was defeated in a pitched battle which resulted in the death of several prominent commanders, including the Earl of Gloucester and Sir Robert Clifford, and capture of many others. The victory against the English at Bannockburn is the
Robert the Bruce planned a major military campaign with the support of Lancaster and the barons, mustering a large army of between 15,000 and 20,000 men. In the spring of 1314, Edward Bruce laid siege to Stirling Castle, a key fortification in Scotland whose governor, Philip de Mowbray, agreed to capitulate if not relieved before 24 June 1314. In March, James Douglas captured Roxburgh, and Randolph captured Edinburgh Castle, while in May, Bruce again raided England and subdued the Isle of Man. News of the agreement regarding Stirling Castle reached the English king in late May, and he decided to speed his march