The generous policy of Tib. Sempronius Gracchus in B.C. 179[58] had secured for Spain a long period of tranquillity. But in B.C. 153, the inhabitants of Segeda having commenced rebuilding the walls of their town, which was forbidden by one of the articles in the treaty of Gracchus, a new war broke out, which lasted for many years. The Celtiberians in general espoused the cause of Segeda, and the Consul Q. Fabius Nobilior made an unsuccessful campaign against them. His successor, the Consul M. Claudius Marcellus, grandson of the Marcellus who was celebrated in the Second Punic War, carried on the war with vigor, and concluded a peace with the enemy on very fair terms (B.C. 152). The Consul of the following year, L. Lucinius Lucullus, finding the Celtiberians at peace, turned his arms against the Vaccaei, Cantabri, and other nations as yet unknown to the Romans. At the same time the Praetor Ser. Sulpicius Galba invaded Lusitania, but, though he met with some advantage at first, he was subsequently defeated with great loss, and escaped with only a few horsemen. In the following year (B.C. 150) he again invaded the country from the south, while Lucullus attacked it from the north. The Lusitanians therefore sent embassadors to Galba to make their submission. He received them with kindness, lamented the poverty of their country, and promised to assign them more fertile lands, if they would meet him in three bodies, with their wives and children, in three places which he fixed upon. The simple people believed him. But he meditated one of the most atrocious acts of treachery and cruelty recorded in history. He fell upon each body separately, and butchered them, men, women, and children, without distinction. Among the very few who escaped was Viriathus, the future avenger of his nation. Galba was brought to trial on his return to Rome on account of this outrage; and Cato, then in the 85th year of his age, inveighed against his treachery and baseness. But Galba was eloquent and wealthy, and the liberal employment of his money, together with the compassion excited by his weeping children and ward, obtained his acquittal.