Battle of Bannockburn celebrated instance of single combat. Bohun charged at Bruce and, when the two passed side by side, Bruce split Bohun's head with his axe. The Scots then rushed the English forces under Gloucester's and Hereford's command, who retreated, struggling back over the Bannockburn. The second English cavalry force was commanded by Robert Clifford and Henry de Beaumont. Their forces included Sir Thomas de Grey of Heaton, father of the chronicler Thomas Grey. The younger Grey described the battle: <section begin=Beaumont-vs-Grey /> <section end=Beaumont-vs-Grey /> During the night the English forces crossed the stream known as the Bannockburn, establishing their position
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