Capture of Edinburgh Castle
Such was Douglas' burgeoning experience and ability, that he was able to recapture the heavily defended
Castle of Edinburgh, in English hands since the invasion of 1335. A repeat of
Thomas Randolph, 1st Earl of Moray's daring recapture in 1314 where they scaled the Castle-rock was impossible as a result of Edward's new fortifications. Douglas had to come up a new strategy. In fact he went for a very old one, that of the
Trojan Horse. The garrison of the castle in constant need of supplies and fodder for their beasts and horses, used various local merchants for that purpose.
Douglas and his lieutenants dressed as merchants, and acquired some
hay wains, in which they concealed their warriors. On gaining entry to the castle the final wagon stopped to bar the gates from closing. Douglas' men poured from the wagons and through the open gates came the citizenry of Edinburgh to slaughter the English defenders, throwing many off the Castle-rock.
Control of Edinburgh gave Douglas the power and influence to control all of Southern Scotland from Dumfries to the Merse. However, his legal position was tenuous and had to be maintained by force.
While his predecessor "The Good Sir James", had been tied by bonds of personal friendship and loyalty to The Bruce, there were no such links between the exiled David II and the remaining Guardian, Robert Stewart. William received no support militarily and no preference in the issuing of charters of land from Robert. To ensure that his efforts to secure his pre-eminence were not in vain, Douglas decided to visit King David in France in an attempt to forge a friendship between them.