Sir John Colborne became administrator on the departure of Lord Durham, and subsequently governor-general. Unhappily he was immediately called upon to crush another outbreak of the rebels, in November, 1838, in the counties watered by the Richelieu River, and in the district immediately south of Montreal. Dr. Robert Nelson and some other rebels, who had found refuge in the frontier towns and villages of Vermont and New York, organised this second insurrection, which had the support of a considerable number of habitants, though only a few actually took up arms. The rising, which began at Caughnawaga, was put down at Beauharnois, within a week from the day on which it commenced. The authorities now felt that the time had passed for such leniency as had been shown by Lord Durham; and Sir John Colborne accordingly established courts-martial for the trial of the prisoners taken during this second insurrection, as it was utterly impossible to obtain justice through the ordinary process of the courts. Only twelve persons, however, suffered the extreme penalty of the law; some were sent to New South Wales—where however they were detained only a short time; and the great majority were pardoned on giving security for good behaviour.
While these trials were in progress, and the government were anxious to give peace and security to the province, refugees in the border states were despatching hands of ruffians to attack and plunder the Loyalists in the Eastern Townships; but the government of the United States intervened and instructed its officers to take decisive measures for the repression of every movement in the territory of a friendly Power. Thus the mad insurrection incited by Papineau, but actually led by the Nelsons, Chenier and Brown, came at last to an end.