It was now necessary for the detectives to devise a new plan. Robert Pinkerton knew that some three years earlier Donahue had been concerned in the robbery of a bank at Winnipeg, and also in the robbery of a hardware store at Quebec. His brother, William Pinkerton, he also knew, had a personal acquaintance with Donahue, from having arrested him a number of years before. He therefore sent for William Pinkerton to come to New York from Chicago, and on his arrival proposed to him that he go to Fort Erie, get an interview with Donahue, and tell him of Proctor's treachery in betraying Collins and himself; impress upon him that Proctor was a dangerous man to have dealings with; and try to induce him to lend his aid in delivering Proctor and Collins over the line, just as Robert Pinkerton had sought to have Proctor do in the case of Donahue and Collins. Donahue was known as a "stanch" man,--that is, one who is true to his friends,--and it was thought probable that he would refuse to take part in any such scheme. But in that event William Pinkerton was to threaten him with arrest for the old robberies at Winnipeg and Quebec. This plan was carried out by William Pinkerton with greater success than had been expected. At first Donahue stoutly refused to betray a comrade, but the danger threatening himself was made to appear so great that finally, seeing no other way out of his difficulties, he consented to do what was asked of him in regard to Proctor. Against Collins, however, he declined to give any aid. By working on Proctor's natural fear of arrest, he easily persuaded him that the immediate departure of all three of them--himself, Proctor, and Collins--for Europe was advisable. It was arranged that they should not sail from Quebec or Halifax, since the steamers from those points were likely to be watched by detectives, but that they should leave Fort Erie stealthily by night, make their way separately to Montreal, and meet there. This plan was carried out, and within a few days the three were in Montreal, all apparently of one mind in their desire to escape the country, though in reality Proctor was the only one of the three who thought himself in danger. Donahue had taken Collins into his confidence, and Collins was quite of Donahue's opinion that they were doing the proper thing in saving themselves by surrendering a man who had shown himself willing to betray them.