Oswald Barron, 1911 Encyclopædia Britannica, Volume 18… (1911)
“ The day before Mortimer had denounced Montagu as a traitor, but Montagu struck at once and his success was rewarded by grants from the forfeited lands of March. In 1337 he was created earl of Salisbury, and on the death of Thomas of Brotherton in 1338 he was made marshal of England. His king employed him in missions to France, Scotland, Germany and Castile, but war was, as with most of the men of his house, the chief business of his short life. ”
