Clan Bruce Scottish army at the Battle of Bannockburn in 1314 where the English were defeated. In 1334 Thomas Bruce, who claimed kinship with the royal house of Bruce, organized a rising in the Kyle, along with Robert Stewart (later Robert II of Scotland) against the English. Robert the Bruce's son, David II of Scotland became king on his father's death in 1329. In 1346 under the terms of the Auld Alliance David marched south into England in the interests of France, but was defeated at the Battle of Neville's Cross and imprisoned on 17 October of that year, and remained in
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