Marmaduke Thweng, 1st Baron Thweng Castle by the English leader John de Warenne, 6th Earl of Surrey. The castle was quickly starved into submission, and Thweng and FitzWarin were taken prisoner to Dumbarton Castle. He was summoned to Parliament in 1307, thus becoming Baron Thweng. At the Battle of Bannockburn in 1314, however, after the English defeat, Sir Marmaduke apparently made no attempt to escape. Instead he wandered over the battlefield until he located Robert the Bruce; only then was he prepared to surrender, and only to the victorious King. Robert recognised Sir Marmaduke and released him and Ralph de Monthermer, also captured, both without
Robert the Bruce the heavy fighting. The historian Roy Haines describes the defeat as a "calamity of stunning proportions" for the English, whose losses were huge. In the aftermath of the defeat, Edward retreated to Dunbar, then travelled by ship to Berwick, and then back to York; in his absence, Stirling Castle quickly fell. Freed from English threats, Scotland's armies could now invade northern England. Bruce also drove back a subsequent English expedition north of the border and launched raids into Yorkshire and Lancashire. Buoyed by his military successes, Bruce's forces also invaded Ireland in 1315, in an attempt to free the country