Thus befriended, the royal claimant, accompanied by ten galleys containing his followers and adherents, proceeded to Gallipoli, where he no sooner disembarked than the town and suburbs acknowledged his pretensions, only the garrison of the fortress holding out. Leaving a small besieging force before the town, he made rapid marches towards the Isthmus of Athos, his army increasing rapidly as he proceeded, and several places falling into his hands. The Sultan sent his Vizier to Adrianople, where he collected an army of thirty thousand men, with which to oppose the invaders. Several great vassals of the empire having now declared for Mustapha, he was quite prepared to face the imperial army, and as soon as it came in view he advanced courageously towards it, and commanded the troops to lay down their arms. As if by magic, says one historian, the soldiers obeyed, and the pretender suddenly found himself master of the situation without having to lose a single man. The unfortunate Vizier and his brother were captured; the former was put to death, but the latter released. On receipt of this intelligence the fortress of Gallipoli capitulated, and Demetrius, the commander of the Greek forces, was about to garrison it with his soldiers when Mustapha interposed, and, unmindful of his treaty with Emanuel, said that he was not making war for the Emperor's profit. The Greeks, thus beholding all their hopes of aggrandizement dissipated, sought to renew their alliance with the Sultan, but their monarch obstinately persisting in his demand for Amurath's brothers being placed in his hands as hostages, the negotiations fell through.