Robert the Bruce him control of much of Scotland, and at the Battle of Bannockburn in 1314, Robert defeated a much larger English army under Edward II of England, confirming the re-establishment of an independent Scottish kingdom. The battle marked a significant turning point, with Robert's armies now free to launch devastating raids throughout northern England, while also extending his war against the English to Ireland by sending an army to invade there and by appealing to the Irish to rise against Edward II's rule. Despite Bannockburn and the capture of the final English stronghold at Berwick in 1318, Edward II refused to
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