It was well understood that the "days of truce" lasted until sunrise on the morning after the breaking up of the meeting, so that all who had been present at it might have ample time to perform the return journey homewards without being exposed to molestation. Trusting to this, Armstrong, whose way lay in the same direction as that of the English Borderers, rode on unconcernedly on his own side of the Liddel and in full sight of them. Their sense of honour was not proof against the temptation of availing themselves of so favourable an opportunity. Making it an excuse for their violation of Border law that at one point Armstrong was obliged to pass out of the territory included in Buccleuch jurisdiction, they crossed the stream, thus committing an act of invasion, fell upon him at such odds as made resistance vain, took him prisoner and carried him off to Carlisle, where he was lodged in the Castle. The indignation aroused by this unwarrantable breach of faith was all the greater from the fact that Willie was popular amongst his kinsmen and neighbours for the daring and resourcefulness which had often ensured the success of the raids on which they had sallied out together. Buccleuch protested against the violation of the truce and demanded Kinmont's liberation; but his remonstrances produced no result. Neither was the Scottish Government itself more successful with Scroope when the general outcry obliged it to interfere. Buccleuch then resolved to take the law into his own hands. As a first step towards the execution of the bold plan which he had conceived, he got his signet ring conveyed to the prisoner. This he contrived to do through the agency of one of the Grames, who, though English Borderers themselves, appear, from Scroope's repeated complaints against them, to have been in league with the Scottish Warden. A horse race promoted by him afforded him an opportunity of communicating with Kinmont's kinsmen and friends without exciting suspicion. He had no difficulty in enlisting recruits, mainly from amongst the Scotts, the Elliots, the Bells, and, as a matter of course, the Armstrongs, including Willie's sons. Before Kinmont, whose capture had been effected on March 17, had been a month in Carlisle Castle, where, after promising that he would make no attempt at escape, he appears to have been treated with some consideration, everything was ready for a dash into England.