Tacfarinas accordingly spread rumours that elsewhere also nations were rending the empire of Rome and that therefore her soldiers were gradually retiring from Africa, and that the rest might be cut off by a strong effort on the part of all who loved freedom more than slavery. He thus augmented his force, and having formed a camp, he besieged the town of Thubuscum. Dolabella meanwhile collecting all the troops on the spot, raised the siege at his first approach, by the terror of the Roman name and because the Numidians cannot stand against the charge of infantry. He then fortified suitable positions, and at the same time beheaded some chiefs of the Musulamii, who were on the verge of rebellion. Next, as several expeditions against Tacfarinas had proved the uselessness of following up the enemy's desultory movements with the attack of heavy troops from a single point, he summoned to his aid king Ptolemæus and his people, and equipped four columns, under the command of his lieutenants and tribunes. Marauding parties were also led by picked Moors, Dolabella in person directing every operation.