Wars of Scottish Independence an outlaw. Bruce later came out of hiding in 1307. The Scots thronged to him, and he defeated the English in a number of battles. His forces continued to grow in strength, encouraged in part by the death of Edward I in July 1307. The Battle of Bannockburn in 1314 was an especially important Scottish victory. In 1320, the Declaration of Arbroath was sent by a group of Scottish nobles to the Pope affirming Scottish independence from England. Two similar declarations were also sent by the clergy and Robert I. In 1327, Edward II of England was deposed and killed.
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