to take action against the Albany Stewarts while Murdoch's brother, John Stewart, Earl of Buchan and Archibald Douglas, 4th Earl of Douglas were fighting the English in France alongside their Dauphinist French allies. Buchan was a soldier with an international reputation, and commanded the large Scottish army of around 6,000 men, a formidable force. In addition he was Constable of France, making him the effective commander of the entire French army. However, both he and Douglas were killed at the Battle of Verneuil in August 1424 and the Scottish army was routed—the loss of these Albany allies with their fighting force left Murdoch politically exposed. James moved swiftly against his Albany Stewart relatives soon afterwards. Arrest Murdoch was arrested, along with his younger son Lord Alexander Stewart. Albany was at first confined in the castle at St. Andrews and afterwards transferred to Caerlaverock Castle. His wife Isabella was captured in the family's fortified castle of Doune, their favourite residence, and committed to Tantallon Castle. James's older brother David Stewart, Duke of Rothesay had died young, in Falkland Castle, while in the care of Murdoch's father, Robert Stewart, Duke of Albany. Though Albany had been exonerated by Parliament, the suspicion of foul play remained. Moreover, neither Duke Robert nor his son Murdoch had exerted themselves in negotiating James's release while in English captivity. This may well have left James with the suspicion that the Albany Stewarts had personal designs on the throne of Scotland. At this time Albany's other son Walter was already in prison. James, Murdoch's youngest son (also known as James the Fat), escaped arrest. and fled into the Lennox, where he began to organise a revolt, leading men of Lennox and Argyll in open rebellion against the crown. He attacked and burned the burgh of Dumbarton with much loss of life. This resort to violence by Albany's youngest son may spurred the king into bring a charge of treason against the Albany Stewarts, however, it is likely there was other evidence (no longer extant) for him to have gained the support of the leading magnates. Trial and execution Duke Murdoch, his sons Walter and Alexander, and Duncan, Earl of Lennox were in Stirling Castle for their trial on 18 May 1425, at a prorogued parliament in the presence of the King. An assize of seven earls and fourteen lesser nobles heard the evidence that linked the prisoners to